Your probably going to get a lot of opinions on this, and the bottom line will be to try a few different ones out and see what feels best to you. I shoot a TRU-Ball Tornado caliper release, and have never had a single problem (nor have any friends that shoot them). It has adjustable trigger pull and the length of the release itself is adjustable which were both a plus for me. Other style options include wrist strap (velcro or buckle), hand-held, and trigger position (depending on which finger you prefer to use to squeeze the trigger). I know Scott Archery makes a heckuva release also, but I don't have any personal experience with them.

--Man who fish in other man's well often catch crabs--