For osu! definitely avoid browns. Browns won't feel much different from the membrane you use now.
If you want a sensitive, quiet keyboard, I would suggest getting a keyboard from https://www.pcgamingrace.com/products/gmmk-tkl-tenkeyless-customized with Gateron Clears, and get a pack of o-rings to block out the noise. For the record Gateron Clears are 10 grams lighter than reds, and the typing experience is heavenly. It's also linear
If you want a sensitive, quiet keyboard, I would suggest getting a keyboard from https://www.pcgamingrace.com/products/gmmk-tkl-tenkeyless-customized with Gateron Clears, and get a pack of o-rings to block out the noise. For the record Gateron Clears are 10 grams lighter than reds, and the typing experience is heavenly. It's also linear