The answer — one pick, priced
Get the
Samsung ViewFinity S80UD 37"
No budget ceiling
The cheapest monitor here with both a KVM switch and Gigabit Ethernet — two laptops share one keyboard, one mouse and 37 inches of 4K for $368.
Fit ledger — need → measured evidence
■ The catch — co-equal billing, always
It is a VA panel at ~119 PPI, and the second person is sitting off-axis. 4K spread across 37 inches works out to roughly 119 PPI versus 163 on a 27-inch 4K, so text is noticeably softer. VA colour shifts toward the edges of a screen this wide — exactly where someone sharing the desk is looking from. 60Hz, 350 nits, no HDR worth the name.
Dealbreaker? Runner-up №1 is a 163 PPI IPS panel for $18 less ↓
■ Every product has a catch. Verdicts that hide it are how bad buys happen.
Don't buy this if…
- you need a gaming-first monitor with high refresh rate (>144Hz) and low latencyHigh refresh rate monitor verdict →
- you specifically want a KVM switch as the primary buying criterion rather than USB-C dockingKVM monitor verdict →
- you want a portable USB-C monitor for travelPortable monitor verdict →
- you need an external USB-C dock or hub, not a monitor with built-in hub
Wrong product for you is still a bad buy. These are the cases where we'd send you somewhere else.
Runners-up — if your needs differ
Adjacent verdicts — other needs, same method
Different budget, different household, different job — each of these is already researched, priced and verified. Take the one that matches your need.
Traps — this verdict avoids
Why the Samsung ViewFinity S80UD 37" is right for you
It avoids every trap below — and for two, no cap, it is the pick because it delivers:
The hub quietly drops to USB 2.0
Over plain USB-C DisplayPort Alt Mode, driving 4K at 120Hz eats the lanes the hub needs for data — your downstream USB ports fall back to USB 2.0 speeds and an external SSD crawls. Keeping both 4K120 *and* 10Gbps hub throughput needs a Thunderbolt 4 host, not just a Thunderbolt 4 monitor.
Same name, different panel
The Samsung ViewFinity S80UD ships as a 27-inch IPS, a 32-inch IPS and a 37-inch VA under one model name at very different prices; the BenQ GW2786TC is a different price in black and in white. Panel size, panel technology and colourway are part of the SKU — check the full model number (LS37D800UANXZA, not LS27D802UANXGO) before you click buy.
Watts are negotiated, not promised
USB-C PD on these monitors runs 65W to 140W, and the number is a ceiling — the laptop and monitor negotiate down. A 65W monitor will charge a 16-inch MacBook Pro, just slower than it drains under load. Only 140W Extended Power Range over Thunderbolt 4 (the Dell U2725QE and U3225QE) keeps a high-wattage laptop at full charge while you work.
Provenance — 11 sources, dated
Winners are picked from the full research dossier at knowledgelib.io. Prices, stock and listings are re-verified monthly.