I have not visited all the beaches, but the ones I have visited I would recommend.
The first and most basic beach, in my opinion, the least interesting is the Patong beach which is a very long sandy beach where you do not have so many interesting things.
Freedom beach is the most beautiful beach I have ever seen. It is a small beach some 300 meters long. You don't have many facilities on this beach but this beach is special because of some other things. It is surrounded by palm trees and the sand is fine and white. To get to the beach it is possible only by boat and I believe that someone is the emperor of that beach
Next beach is Kamala beach this beach is especially nice for me because it has the best club with daily parties (Cafe Del Mar)
This beach is the exact opposite of Freedom beach is much more urban and has too much activity from surfing to driving jetskiing
The last beach I will introduce to you is Bang Tao beach. This beach is one of the biggest beaches I have ever seen but it stays in my memory only because of the restaurant located on the beach (Catch beach club) this is a must-visit
I hope I helped you at least a little bit
I'll see you soon