Eh it depends. I would definitely not use rubber dome keyboard for osu! now that I have a mech. But I also know I don't like regular gaming on it compared to my old keyboard.
I used to do a bunch of fps's before I quit, so I bought the steel series merc stealth(which I still have, just not hooked up). This is what it looks like(not my picture).
I'm sure you noticed but there's a gaming pad to the left of the keyboard and it is amazing. I loved it for all the fps's I played and other games. Just not osu! It's not mech.
So it depends on what you do more. Both are awesome keyboards but have different purposes for me. If you plan on getting real serious for osu and plan on playing it a lot, get a mech keyboard. Otherwise buy something like above.
I used to do a bunch of fps's before I quit, so I bought the steel series merc stealth(which I still have, just not hooked up). This is what it looks like(not my picture).
I'm sure you noticed but there's a gaming pad to the left of the keyboard and it is amazing. I loved it for all the fps's I played and other games. Just not osu! It's not mech.
So it depends on what you do more. Both are awesome keyboards but have different purposes for me. If you plan on getting real serious for osu and plan on playing it a lot, get a mech keyboard. Otherwise buy something like above.