There was an older thread about this if you wanna skim through for suggestions.
I cannot stand a loud, scratchy sounding yoyo. I’ve traded away some because of this (looking at you, Sherpa!) OD 10 Ball bearings can be the quietest when lubed right, but man, they get ridiculously loud once that lube dries up.
One Drops are generally more quiet than the rest of my collection. It’s hard to say which one is the most quiet… My quietest non-OD throw is probably the Recess Komodo. It’s almost dead silent with a quiet bearing in it. Right now I have an Original Throw concave and they are really quiet and smooth.