Main trade-off
CalDigit TS4
No direct HDMI socket. HDMI conversion must use the correct compatible adapter, and ordinary USB-C data sockets do not output video.
Head-to-head
CalDigit TS4 vs Plugable TBT4-UDZ: TS4 keeps Thunderbolt gear, UDZ connects HDMI screens directly
The short answer
TS4 keeps downstream Thunderbolt equipment connected, while TBT4-UDZ connects HDMI screens directly. Choose TS4 when a TB drive or another verified TB peripheral is part of the desk. Choose UDZ when direct HDMI or DP connections matter more, especially for a supported Windows multi-screen setup. UDZ has no downstream TB port, and its four video sockets do not provide four native Mac displays. TS4 has no HDMI socket, so HDMI monitors need compatible adapters.
Before you choose
The reasoning and the trade-offs
A home recording or photo setup needs a peripheral check before a screen upgrade
A TB-only drive or a Thunderbolt audio interface can be the one piece of equipment that prevents UDZ from replacing a TS4-style desk. UDZ has no downstream Thunderbolt port. TS4 has two, with one potentially used by a second monitor. That can leave a branch for the peripheral when the other screen uses DisplayPort. The exact audio interface still needs manufacturer approval for the laptop, OS and dock arrangement, so the spare socket alone does not establish audio compatibility or latency. If the device also supports USB, or can stay on a separate laptop port, UDZ becomes more practical. Identify the protocol of the device that cannot easily be replaced.
What this is based on
Two versus zero downstream TB ports crossed with a TB-only peripheral and one DP screen. Audio-interface compatibility and real-time performance remain explicitly unverified. Dual-protocol or separate-host connections can reverse the choice.
Main trade-off
Plugable TBT4-UDZ
No downstream Thunderbolt port. More fixed monitor sockets do not override the Mac’s native screen limit.
CalDigit TS4
- Choose it for
- A Thunderbolt-only drive or other verified TB accessory must stay attached to the dock, alongside a supported screen plan.
- Several USB-A accessories should remain connected directly, and an existing DisplayPort screen suits the fixed output.
- Main trade-off
- No direct HDMI socket. HDMI conversion must use the correct compatible adapter, and ordinary USB-C data sockets do not output video.
Plugable TBT4-UDZ
- Choose it for
- Existing HDMI or DP monitors should use direct connections, and no downstream TB device is required.
- A verified Windows host needs the supported MST screen layout. A Mac must use the documented separate output groups.
- Main trade-off
- No downstream Thunderbolt port. More fixed monitor sockets do not override the Mac’s native screen limit.
About this comparison
TS4 vs TBT4-UDZ for HDMI monitors, a Thunderbolt drive and a shared Mac or Windows desk. Check the extra connections hidden by the total port count.
Both are established Thunderbolt 4 desk docks with 98W certified host power and 2.5GbE. They compete for the same dual-screen laptop desk while making a different trade between native TB expansion and fixed monitor sockets.
Winner by situation
Start with what you need it to do
A TB-only drive must remain connected to the dock
TS4 has downstream TB ports. UDZ has none.
- CalDigit TS4
- Better fit
- Plugable TBT4-UDZ
- Not suitable
Two HDMI screens should retain direct HDMI cables
TS4 needs compatible conversion. Check UDZ output grouping.
- CalDigit TS4
- Caution
- Plugable TBT4-UDZ
- Better fit
A verified Windows setup needs more than two external displays
UDZ supports qualified MST layouts. Exact host and modes remain essential.
- CalDigit TS4
- Caution
- Plugable TBT4-UDZ
- Better fit
The laptop needs 140W through the host cable
Both provide 98W certified host power.
- CalDigit TS4
- Not suitable
- Plugable TBT4-UDZ
- Not suitable
What matters in practice
The differences that matter
A home recording or photo setup needs a peripheral check before a screen upgrade
A TB-only drive or a Thunderbolt audio interface can be the one piece of equipment that prevents UDZ from replacing a TS4-style desk. UDZ has no downstream Thunderbolt port. TS4 has two, with one potentially used by a second monitor. That can leave a branch for the peripheral when the other screen uses DisplayPort. The exact audio interface still needs manufacturer approval for the laptop, OS and dock arrangement, so the spare socket alone does not establish audio compatibility or latency. If the device also supports USB, or can stay on a separate laptop port, UDZ becomes more practical. Identify the protocol of the device that cannot easily be replaced.
How we reached this conclusion
Two versus zero downstream TB ports crossed with a TB-only peripheral and one DP screen. Audio-interface compatibility and real-time performance remain explicitly unverified. Dual-protocol or separate-host connections can reverse the choice.
Keeping two HDMI monitors makes the adapter budget part of the decision
UDZ can connect two HDMI monitors directly using the correct output groups for the host. TS4 has no HDMI output, so the same screens need compatible conversion from its video-capable connections. If using TS4’s DisplayPort output, CalDigit specifies an active DP-to-HDMI adapter. A passive cable bought only because the plugs fit is not the documented solution. For an office desk with no TB-only accessories, UDZ can avoid those extra parts. For a desk that must keep a TB drive, TS4 may justify the adapters because UDZ cannot supply that storage connection. Check the exact resolution and refresh support of every adapter, not just the dock’s display headline.
How we reached this conclusion
Direct HDMI availability versus TS4’s documented active DP-to-HDMI requirement. No invented adapter price, universal refresh support or guarantee that any USB-C video cable works.
The work laptop and personal Mac can need different monitor wiring
UDZ can suit a supported Windows setup with more than two screens through its MST design. A personal Macsharing that desk cannot inherit the same display count. Supported dual-screen Mac use requires one output from each UDZ group, and a basic M1 or M2 laptop remains limited to one native external screen. If both laptops use only two screens and a TB drive, TS4 can be the more useful arrangement. If the Windows machine genuinely uses the extra displays, UDZ has a reason to exist at that desk, but plan the Mac’s smaller usable screen set before buying. Neither dock is a hardware KVM, so swapping hosts is a separate action and attached storage needs safe removal.
How we reached this conclusion
UDZ Windows MST and Mac output-group behavior crossed with alternating work and personal computers. TS4 retains TB expansion. No universal four-screen Windows promise or automatic switching claim.
Choice A
CalDigit, TS4-US 500971
CalDigit TS4
A Thunderbolt-only drive or other verified TB accessory must stay attached to the dock, alongside a supported screen plan.
- Best matched use
- A Thunderbolt-only drive or other verified TB accessory must stay attached to the dock, alongside a supported screen plan.
Checked facts
- Downstream TB expansion: Two TB4 ports
- Fixed monitor outputs: One DisplayPort 1.4, no HDMI
- Mac display arrangement: Native host limit applies
- Certified laptop power: 98W
Choice B
Plugable, TBT4-UDZ
Plugable TBT4-UDZ
Existing HDMI or DP monitors should use direct connections, and no downstream TB device is required.
- Best matched use
- Existing HDMI or DP monitors should use direct connections, and no downstream TB device is required.
Checked facts
- Downstream TB expansion: None
- Fixed monitor outputs: Two HDMI and two DisplayPort, in two output groups
- Mac display arrangement: Native host limit, with one output per group for dual Mac use
- Certified laptop power: 98W
Meaningful differences
What changes the fit
| What changes | CalDigit TS4 | Plugable TBT4-UDZ | Why it matters |
|---|---|---|---|
| Downstream TB expansion | Two TB4 ports | None | The drive or interface already owned can decide the purchase before monitor socket count does. |
| Fixed monitor outputs | One DisplayPort 1.4, no HDMI | Two HDMI and two DisplayPort, in two output groups | UDZ can keep HDMI cables. TS4 needs compatible conversion for those screens. |
| Mac display arrangement | Native host limit applies | Native host limit, with one output per group for dual Mac use | Four video sockets are not four independent Macstreams. |
| Certified laptop power | 98W | 98W | A higher-power laptop may need its original charger on either dock. |
| Network and cards | 2.5GbE with PCIe host requirement, UHS-II readers | 2.5GbE and UHS-II readers | These shared interface classes do not settle the TB-accessory versus fixed-video choice. |
What you give up
Every choice has a cost
If you choose CalDigit TS4
- CalDigit requires an active DP-to-HDMI adapter for that conversion. Include the correct cables or adapters in the complete desk cost.
If you choose Plugable TBT4-UDZ
- A Thunderbolt-only drive needs a suitable laptop port or another verified connection arrangement. Ordinary USB-C data is not a replacement.
Recommendation switch
The decision flips if...
A verified TB-only peripheral is the fixed part of the setup
Choose CalDigit TS4. TS4 supplies downstream TB connectivity while UDZ does not.
Direct HDMI or a qualified Windows multi-screen plan is the missing feature
Choose Plugable TBT4-UDZ. UDZ can avoid video adapters and provide the supported screen routes.
What matters in practice
Before you choose
You want screens and existing accessories to stay connected, without discovering that the more screen-heavy dock has nowhere for a Thunderbolt-only device.
What this comparison cannot tell you
- No audio-latency, file-speed or reliability ranking. Neither dock bypasses native Mac limits or supplies 140W host charging. A peripheral socket is not a full compatibility certification.
What the facts say
What the comparison shows
Useful conclusions from the current docking stations comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| CalDigit TS4 |
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| Plugable TBT4-UDZ |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
CalDigit TS4
A Thunderbolt-only drive or other verified TB accessory must stay attached to the dock, alongside a supported screen plan.
Several USB-A accessories should remain connected directly, and an existing DisplayPort screen suits the fixed output.
See price & reviews on AmazonPlugable TBT4-UDZ
Existing HDMI or DP monitors should use direct connections, and no downstream TB device is required.
A verified Windows host needs the supported MST screen layout. A Mac must use the documented separate output groups.
See price & reviews on AmazonLinks open in a new tab.