Highly subjective preferences on this topic. I switched from a wrist to thumb release last off-season. It takes time but I’d never go back. I bought a Nok2It and a Silverback. They’re designed by John Dudley and they go together. SB is a pure back-tension release to ensure proper form and is great to train with. I highly recommend if you’re going to switch. The Nok2It is a thumb release for hunting. Check out Dudley’s training series on YouTube. It’s excellent.
Remember, for diehards, there is no off-season, only training and scouting season.