I tried to play on pretty much all types of keyboards (even apple keyboards)
Apple and laptop (chiclets) keyboards are nice because you don't get really tired easily, but there is not a really long travel distance.
Standard membrane keyboards like a dell office keyboard has more travel but makes you feels tired after several plays.
Concerning mechanical switches:
There are 3 keyboard switches manufacturers:
Cherry MX: the standard of all mechanical switches
Kailh: cheaper version of cherry switches with cheaper materials.
Gateron: Sort of a clone of cherry but newer with a slightly different feel, those are my personal favorite.
Here comes the important part: switches
Blues have both a bump and an audible click when the switch is pressed to its actuation point. This is nice for typing (especially touch typing) since it’s a clear indication that you’ve pressed the switch. It’s great for avoiding “bottoming out,” meaning the switch is fully depressed, which can help reduce fatigue from typing over long periods of time. However, playing osu! is not the same as typing. The game is much more hectic and if you try to feel or listen to the click, you will be pulling your attention away from the game. Although, the nice and strong bump helps you if you need to "control" you clicks.
Brown are similar to blues but the bump is less noticeable and they are way more silent than blues. For typists, it feels weird because you can feel the bump but you don't hear anything, for osu!, I think they are great because it offers a mid range between silent and tactile.
Reds are linear, which means pressing on the switch feels like pressing on a spring, for a typist they are terrible because there are no way to find where is the actuation point. For osu!, it may be an advantage since there is no bump, which results in faster actuations, but since I can't find the actuation point it is possible that I press the keys very quickly and register the key only once. Btw it can also get really loud if you press really hard on the keyboard.
Silent are the same as reds but it is stealthier and when you bottom out, you can feel like there is a dampener which I don't think are the best.
Speed switches are actually the ones I did not try since I don't think reducing the travel distance from 2 to 1.2 mm gives a real advantage when playing osu!. Think of it like an Ipad touch keyboard.