https://input.club/the-comparative-guide-to-mechanical-switches/Well I cant check switches out because in local shops they sell only Razer and membrane keyboards. If there isnt a way to change a switches in Varmilo VA87M then thats a huge problem because I dont feel like spending 140$ on a keyboard which can start double tapping after 3 years and I cant just buy 2 new switches to make it work again.
Input Club has writeups about most switches, plus force curves. The plot.ly site has force curves listed for many obscure switches. You can read the force curves to get an idea of how various switches feel when pressed.
Which switch to get is mostly preference. Tactile switches are nice for accuracy because they provide physical feedback around the moment the switch actuates, but top players have gotten good at osu using all kinds of switches.
re: Switch smoothness: You can always lube them. Osu is hard on the contact leaf for mx-style switches, so you'll see them failing earlier when playing this game than you would with just casual desktop use. Some exotic switch types can be more resistant to this, like hall effect switches, but most players worried about switch wear just get keyboards with swappable switches or spend less by getting a keypad instead.
(Something like this: https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=3482 , but there are cheaper options.)
If you don't know what kind of switch you want, maybe you have a local store where you can go to try some of them out?
I'm currently using mx browns, but if I build a keyboard for USB3/firmware reasons I'll probably use matias quiet clicks.