If your goal is to spin more, there are advantages to thicker, like max! Thicker rubbers can help encourage you to brush, use the sponge and topsheet and spin more.
If you hit more than you spin and don't see a reason to change that, then thinner works better.
If you are able to hit and spin at will, then thickness is entirely a subjective choice based on preference.
Sent from the Oracle of Delphi by the Pythia