Dell U3425WE vs LG 34WQ75C-B: Which 34-Inch Work Ultrawide Is Better?
Two IPS ultrawide work monitors with KVM and USB-C docking. Dell has Thunderbolt 4 and 120Hz. LG has an Ethernet port and lower price. Here is the honest buy-guide.
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Both monitors are 34-inch 3440x1440 IPS ultrawides with built-in KVM and enough USB-C Power Delivery to dock a laptop. On paper they look similar. In practice, they target different workstations and the price gap is meaningful.
Short version: if you have a 16" MacBook Pro, the Dell wins on charging headroom. If you're on a 14" MacBook and want the cheaper smart-dock experience, the LG is the value play.
Quick verdict
- Buy the Dell U3425WE if: you want the cleanest premium experience — Thunderbolt 4, 140W PD, 120Hz, KVM, IPS Black, 3-year advance-exchange warranty. Pairs best with a 16" MacBook Pro.
- Buy the LG 34WQ75C-B if: you want docking + KVM at a lower price, you mostly do work (60Hz is fine), and the Ethernet-via-monitor feature replaces a travel adapter.
Panel — IPS Black vs classic IPS
Dell U3425WE: IPS Black panel with 2000:1 contrast, 99% sRGB, 98% DCI-P3. The IPS Black generation is noticeably darker in dark UI work compared to classic IPS — you stop seeing that "gray not black" tint on a dark VS Code.
LG 34WQ75C-B: classic IPS panel with ~1000:1 contrast, 99% sRGB. Colours are excellent; blacks are the typical IPS grey-black.
Winner: Dell by a meaningful margin, especially if you work in dark mode or watch video on the monitor.
Refresh rate
Dell: 120 Hz. Smooth scrolling, window drags feel responsive, and casual gaming is usable.
LG: 60 Hz. Fine for work, but noticeable if you're coming from 120 Hz elsewhere.
Winner: Dell. Once you've used 120 Hz for productivity, 60 Hz feels dated.
Connectivity and docking
Dell U3425WE:
- Thunderbolt 4 upstream (full TB4, not just USB-C)
- 140W Power Delivery — enough to run a 16" MacBook Pro at full load
- HDMI, DisplayPort, USB-C alt-mode
- USB-A + USB-C downstream hub
- KVM built-in
LG 34WQ75C-B:
- USB-C upstream with 96W Power Delivery — good for 14" MacBook Pro; the 16" MBP will draw more under load than the monitor provides (laptop still runs, just slowly loses charge on heavy workloads)
- HDMI, DisplayPort
- RJ-45 Ethernet port — unique feature, the monitor bridges your laptop to wired LAN
- USB-A + USB-C downstream hub
- KVM built-in
Winner for: 16" MacBook Pro / gaming laptops → Dell. 14" MacBook + occasional Ethernet need → LG.
KVM implementation
Both have KVM. The feature lets you share keyboard + mouse + webcam between two computers (one plugged into TB4/USB-C, another into HDMI/DP), and switch inputs with a click.
Dell: KVM switching via button on the monitor or via the Dell Display Manager app. Switches are roughly 2-second delay.
LG: KVM switching via monitor button only. Slightly slower response than Dell's.
Winner: Dell, but both work.
The Ethernet port question
The LG's RJ-45 LAN port is the one thing the Dell doesn't have. It solves a real problem: MacBook Air has no Ethernet, and a dock-plus-ethernet setup usually costs $50–100 extra. The LG monitor bridges this natively.
If you regularly work at a desk with wired Ethernet and don't want a separate USB-C adapter hanging off your laptop, this is a compelling feature. If you use Wi-Fi everywhere, irrelevant.
Stand and ergonomics
Dell: tilt, swivel, height-adjust, pivot (VESA 100x100 mount-compatible). Stand is slim with cable passthrough.
LG: tilt, swivel, height-adjust, pivot (VESA 100x100). Similar ergonomic range, slightly bulkier base.
Winner: tied — both are adequate, a monitor arm improves either.
Warranty
Dell: 3-year advance-exchange, premium panel guarantee (zero bright-pixel defects covered).
LG: 3-year limited warranty.
Winner: Dell. Advance-exchange (they ship you a new monitor before you send the broken one back) is meaningfully better than return-and-wait.
Price
- Dell U3425WE: roughly $900–1,100 depending on sale.
- LG 34WQ75C-B: roughly $500–700.
Gap of $300–500. Whether it's worth it depends entirely on your use case.
Which to buy: by workflow
| Your situation | Pick | |---|---| | 16" MacBook Pro, prefers dark UI work, mixed light gaming | Dell U3425WE | | 14" MacBook Pro / MacBook Air, work-focused, cost-sensitive | LG 34WQ75C-B | | Wants Ethernet-via-monitor convenience | LG 34WQ75C-B | | Watches HDR video or needs true deep blacks | Dell U3425WE | | Games regularly at 100+ fps | Dell U3425WE (120 Hz) | | Has an existing dock / doesn't need monitor to dock the laptop | Consider Alienware AW3423DWF QD-OLED instead |
Alternatives worth considering
- Dell U3824DW: 38-inch version with even more pixels. Expensive but spacious.
- LG 34WN80C-B: the 60W PD version of the LG — cheapest ultrawide with real USB-C docking, but caps out at lower wattage.
- Alienware AW3423DWF: QD-OLED instead of IPS. Better image, burn-in risk, worse as a dock.
See Best Ultrawide Monitors (2026) for the full roundup.