JWK/Durock switches (Tangerines, Alpacas, H1’s, etc.), Inks, and Tealios are the smoothest linears you can get, but for sound profile my preference would have to go to regular Gateron milky top and black bottom combo. With a spring swap and Invyr UHMWPE stem, they’re just as smooth if not more than the switches above, and they have a deeper sound that I personally prefer over the sound of JWKs (thicker plastic used for the housing) and they’re way easier on the wallet.