I find that the thumb style is better for "readiness". You hook your release to your loop as soon as you get situated and let it hang. When a deer comes in you draw, anchor, and shoot. No screwing around with trying to get your release hooked up while you have a buck of a lifetime running in hot after a doe.
I shoot the TRU Ball Incredible right now for competitions along with my Sweet Spot II. They are awesome and I am glad that I switched from a wrist strap release to a handle. It is much easier and more comfortable for me. I started with the TRU Ball Boss X, great release for any genre of shooting. It didn't take me long at all to get used to it. They also have a large selection of other great handles that have helped a lot of people. Hope this helped and good shooting! www.truball.com