Main trade-off
Plugable TBT-UDM
No direct DisplayPort and only Gigabit Ethernet. Its total native display limit is two, with lower limits on some hosts.
Head-to-head
Plugable TBT-UDM vs TBT4-UDZ: TBT-UDM keeps a Thunderbolt drive, UDZ favors more screen routes
The short answer
TBT-UDM keeps a downstream Thunderbolt port, while TBT4-UDZ offers more fixed display sockets and 2.5GbE. Choose TBT-UDM for two compatible HDMI screens plus a Thunderbolt drive. Choose UDZ when direct DisplayPort connections or a supported Windows multi-screen setup matter more than TB storage at the dock. A Mac does not gain four native displays from UDZ’s four video sockets, and two Macscreens must use different output groups.
Before you choose
The reasoning and the trade-offs
The spare Thunderbolt port is useful only after the monitor plan is complete
With two HDMI monitors, TBT-UDM can leave its downstream TB4 port for a Thunderbolt drive. That is a clean work-and-photo-editing layout. If one monitor is DisplayPort-only, however, a compatible TB-to-DP cable takes that same port and the drive loses its direct dock connection. UDZ handles the DP monitor directly, but has no downstream TB port at all. The right answer therefore depends on the actual screen inputs and whether the drive must live on the dock. If both screens accept HDMI, TBT-UDM is the simpler TB-storage choice. If the drive can connect directly to the laptop and DisplayPort cables should stay, UDZ may fit better.
What this is based on
Connector occupancy for two example screen types and a TB-only drive. TBT-UDM one downstream TB branch versus UDZ zero. No assertion that dual-protocol drives cannot use USB or that every video adapter supports every mode.
Main trade-off
Plugable TBT4-UDZ
No downstream Thunderbolt port. Mac dual displays must use one socket per group, and four screen outputs are not four Mac display streams.
Plugable TBT-UDM
- Choose it for
- Two HDMI monitors and a Thunderbolt drive should stay connected to one supported laptop setup.
- Gigabit networking is enough, and the 96W certified host power fits the laptop’s needs.
- Main trade-off
- No direct DisplayPort and only Gigabit Ethernet. Its total native display limit is two, with lower limits on some hosts.
Plugable TBT4-UDZ
- Choose it for
- One or both screens need direct DisplayPort, or a supported Windows host can use the additional MST display routes.
- A ready 2.5GbE local network matters and no downstream Thunderbolt device needs to attach at the dock.
- Main trade-off
- No downstream Thunderbolt port. Mac dual displays must use one socket per group, and four screen outputs are not four Mac display streams.
About this comparison
TBT-UDM vs TBT4-UDZ for HDMI and DisplayPort monitors, a Thunderbolt SSD and home NAS. Check the usable ports left after the screens are connected.
Both are Plugable Thunderbolt 4 desktop docks with native video and near 100W charging. Buyers with two existing monitors can reasonably choose either, but the larger socket count on UDZ removes the downstream TB option.
Winner by situation
Start with what you need it to do
Two HDMI screens and a TB-only drive stay at the dock
TBT-UDM retains one TB port. UDZ has none.
- Plugable TBT-UDM
- Better fit
- Plugable TBT4-UDZ
- Not suitable
Both screens should use their existing DisplayPort cables
UDZ has direct DP sockets. Check different groups for a compatible Mac.
- Plugable TBT-UDM
- Caution
- Plugable TBT4-UDZ
- Better fit
A verified Windows host needs more than two displays
UDZ can use supported MST routes. Exact host and display modes are essential.
- Plugable TBT-UDM
- Not suitable
- Plugable TBT4-UDZ
- Better fit
A basic M1 or M2 Mac needs two native external screens
Neither native dock removes the host ceiling.
- Plugable TBT-UDM
- Not suitable
- Plugable TBT4-UDZ
- Not suitable
What matters in practice
The differences that matter
The spare Thunderbolt port is useful only after the monitor plan is complete
With two HDMI monitors, TBT-UDM can leave its downstream TB4 port for a Thunderbolt drive. That is a clean work-and-photo-editing layout. If one monitor is DisplayPort-only, however, a compatible TB-to-DP cable takes that same port and the drive loses its direct dock connection. UDZ handles the DP monitor directly, but has no downstream TB port at all. The right answer therefore depends on the actual screen inputs and whether the drive must live on the dock. If both screens accept HDMI, TBT-UDM is the simpler TB-storage choice. If the drive can connect directly to the laptop and DisplayPort cables should stay, UDZ may fit better.
How we reached this conclusion
Connector occupancy for two example screen types and a TB-only drive. TBT-UDM one downstream TB branch versus UDZ zero. No assertion that dual-protocol drives cannot use USB or that every video adapter supports every mode.
Four sockets do not give a shared Mac desk four useful screens
UDZ’s extra video sockets are attractive when a Windows work machine drives several displays and a personal Mac uses the same desk later. The Windows MST capability does not transfer unchanged to macOS. A supported two-screen Macsetup must take one output from each group, and a basic M1 or M2 laptop still has its native one-screen limit. Labeling the intended Mac connections can avoid repeatedly changing cables when swapping computers. If both computers only need two HDMI screens, TBT-UDM already covers that simpler plan with a supported host. Choose UDZ for a verified Windows multi-screen need or direct DP convenience, not for an assumed Mac display upgrade.
How we reached this conclusion
UDZ display-group and platform limits crossed with alternating Windows and Mac use. No universal four-screen Windows promise. Host model, resolution, GPU and cable remain gating facts.
A faster NAS and a Thunderbolt drive pull the decision in different directions
A household using both network photo storage and a portable Thunderbolt drive has two distinct data routes. UDZ provides 2.5GbE, useful only when the NAS path can exceed Gigabit, but gives the drive no TB port. TBT-UDM has a TB port but only Gigabit Ethernet. Before choosing, decide which transfer is the recurring delay and whether a separate laptop connection is acceptable for the other device. On a 1GbE switch, UDZ’s network link advantage disappears, making the free TB branch more useful. On a ready 2.5GbE network with the drive already attached directly to the laptop, UDZ can fit the routine. No dock wins both connections by its total port count.
How we reached this conclusion
Independent Ethernet and TB paths crossed with local backup and portable-drive use. min(2.5, 1)=min(1, 1)=1Gb/s switch-link ceiling in the stated slower-switch example. No measured transfer-time claim.
Choice A
Plugable, TBT-UDM
Plugable TBT-UDM
Two HDMI monitors and a Thunderbolt drive should stay connected to one supported laptop setup.
- Best matched use
- Two HDMI monitors and a Thunderbolt drive should stay connected to one supported laptop setup.
Checked facts
- Fixed video outputs: Two HDMI
- Downstream Thunderbolt: One port
- Two-screen Mac layout: Two native displays across HDMI and TB, if host supports them
- Network link: Gigabit Ethernet
Choice B
Plugable, TBT4-UDZ
Plugable TBT4-UDZ
One or both screens need direct DisplayPort, or a supported Windows host can use the additional MST display routes.
- Best matched use
- One or both screens need direct DisplayPort, or a supported Windows host can use the additional MST display routes.
Checked facts
- Fixed video outputs: Two HDMI and two DisplayPort, in two groups
- Downstream Thunderbolt: None
- Two-screen Mac layout: One display from each output group, if host supports both
- Network link: 2.5GbE
Meaningful differences
What changes the fit
| What changes | Plugable TBT-UDM | Plugable TBT4-UDZ | Why it matters |
|---|---|---|---|
| Fixed video outputs | Two HDMI | Two HDMI and two DisplayPort, in two groups | UDZ can reuse DP cables, but grouping and host support limit what runs together. |
| Downstream Thunderbolt | One port | None | A storage plan can reverse a decision based on monitor socket count. |
| Two-screen Mac layout | Two native displays across HDMI and TB, if host supports them | One display from each output group, if host supports both | The Mac’s own ceiling remains. Two neighboring sockets may not be independent Mac paths. |
| Network link | Gigabit Ethernet | 2.5GbE | A faster NAS path can favor UDZ, but a 1GbE switch caps both. |
| Certified host power | 96W | 98W | The 2W difference is not a reason to expect a meaningful charging-time change. |
What you give up
Every choice has a cost
If you choose Plugable TBT-UDM
- A DisplayPort-only monitor needs a compatible TB-to-DP connection, which uses the sole downstream TB port.
If you choose Plugable TBT4-UDZ
- A TB-only drive needs a separate suitable host port or verified expansion plan. Ordinary USB-C data does not replace it.
Recommendation switch
The decision flips if...
Thunderbolt storage must remain behind the two HDMI screens
Choose Plugable TBT-UDM. TBT-UDM preserves the required downstream connection.
Direct DP or verified Windows screen expansion is the missing job
Choose Plugable TBT4-UDZ. UDZ provides those paths, with platform and grouping limits.
What matters in practice
Before you choose
You want room for more screens without discovering that the drive or network used for personal projects needs another adapter.
What this comparison cannot tell you
- No measured file-speed or charging-time difference. Mac and Windows display limits are not interchangeable. Neither dock supplies a hardware KVM or removes safe-eject requirements.
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 |
|---|---|---|---|
| Plugable TBT-UDM |
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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.
Plugable TBT-UDM
Two HDMI monitors and a Thunderbolt drive should stay connected to one supported laptop setup.
Gigabit networking is enough, and the 96W certified host power fits the laptop’s needs.
See price & reviews on AmazonPlugable TBT4-UDZ
One or both screens need direct DisplayPort, or a supported Windows host can use the additional MST display routes.
A ready 2.5GbE local network matters and no downstream Thunderbolt device needs to attach at the dock.
See price & reviews on AmazonLinks open in a new tab.