Originally Posted by Kip69
Blue makes a click in the switch, as does the green and clear I think.
Black, red and brown do not. The sound you hear from all of them (blue inc) is the bottoming out.
Blue, Green, and White ("Milk" if translated from Chinese) click. Blue has a lighter spring, while green and white both have the heavier spring. The click mechanism on the white is made of a different material, though, which results in a milder sound.
Brown and Clear ("White" if translated from Chinese) do not click, but are tactile. Brown has the lighter spring, while clear has the heavier spring. Clear also has a more pronounced tactile point, so some people like to replace the spring in clears with that of browns to make "ergo clear" switches.
Red and Black are linear: non-clicky, non-tactile. Red is light, black is heavy.
As said, keep in mind that a significant portion of the noise is not generated by a mechanism in the switch itself, but comes from reaching the end of the travel. All else being equal, on lighter switches, you'll tend to hit bottom more and harder than on heavier switches, since the spring will absorb more force. Of course, all else is not always equal...some people go overboard with the amount of force they apply when using switches that are too heavy for them, leading to very loud bottoming out.
A note on backlighting...with any backlit keyboard except TG3/Deck, durability of key legends is reduced somewhat compared to non-backlit keyboards. This is so because, to make a backlit key, they start with a clear key, paint the whole thing, and then etch away the paint so that the light can shine through where desired. Over time, the paint gets worn away, especially in the middle of keys and radiating outwards from where it has been etched, resulting in "blobs." The speed with which this happens varies, based on quality/thickness of the paint and what kind of protective upper coating is applied after the process, but in any case, it is something to be aware of. TG3 (on both "TG3"-branded and "Deck"-branded keyboards) uses a different process, where the keys are actually made of multiple pieces (some of which have dye sublimated into them), resulting in greatly increased durability, though also occasional aesthetic issues where light escapes from gaps between pieces of the keys.