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The switch is what you feel on every press, so decide that first. Linear switches travel straight down with no bump, tactile ones have a small bump you can feel, and clicky ones add a sound. A newer group uses magnetic (Hall effect) or analog optical switches: you set the point where a press counts, from 0.1 to 4.0 mm on the boards we list, and the key can reset the moment you start lifting your finger.
Size comes next. Full-size boards keep the number pad, tenkeyless (TKL) drops it, and 75%, 65% and 60% layouts trim further, which leaves more desk for wide mouse movements. A 60% board also loses the dedicated arrow keys, so look at the key layout on the maker's page before you buy.
Then three smaller details: whether the switches are hot-swappable and which sockets they take (3-pin, 5-pin or both), the connection (USB-C cable, a 2.4 GHz receiver or Bluetooth), and the polling rate the brand publishes, which goes from 1,000 Hz up to 8,000 Hz on some esports models.
It depends on your desk and on whether you use the number pad. Tenkeyless is the usual middle ground: it keeps the arrow and function keys, drops the number pad and gives your mouse more room. If you play with low sensitivity and move your arm a lot, a 65% or 60% board frees even more space, but a 60% layout has no dedicated arrow keys.
It means you can pull the switches out and fit new ones without soldering. That lets you try linear, tactile or clicky switches on the same board, or replace one that stops working. Check the socket type the brand lists before buying switches: some boards only take 3-pin switches, while others accept both 3-pin and 5-pin.
They are if you play fast competitive shooters. With these switches you choose how deep a press has to go before it registers, and features like rapid trigger release the key as soon as you start lifting it, which brands design for quick direction changes. For general play and typing, a good linear or tactile mechanical switch does the job.