Besides the type of mechanical switch, deciding on a keyboard size can be a journey. The best advice is to go to your local electronics store and give the different-sized gaming keyboards a test. It's also helpful to ask yourself whether you need a number pad or not. Full-sized (104 keys): standard keyboard with a number padTKL (87 keys): loses the number pad60% (68 keys): loses the number pad, navigation keys, and arrow keys 40% (49 keys): loses the number pad, navigation keys, arrow keys, and number row