Again, that comes down to what you want to do with it. There are broadly three kinds of switch: Linear (smooth from the top of the key press to the bottom), tactile (a small "bump" where the key press registers), and clicky (a loud "click" where the key press registers). These are generically color-coded to Red, Brown, and Blue switches, respectively, though that's not universal — if you want to be sure, look for the linear, tactile, or clicky terms. It's all a matter of individual taste, but gamers tend to prefer linear switches, because they can be pressed and released quickly. Those who type for long stretches of time like tactile switches thanks to their finger feedback. And if you want even more feedback, along with a bit of noise, go witch a clicky switch. Just be aware that the noise might not be so well-received by other people in your home or office! If you want to experiment with different kinds of switches without needing to buy multiple keyboards, get a board with hot-swap sockets. These let you pull out the switches and replace them with a different type. You can even mix and match the switches you put on a single board, if you have enough of them — Reds for WASD and Browns for the rest, for example.