You asked for opinions so take mine for what it's worth.

A release is more consistent, gives a better arrow launch and allows you to hold at full draw longer. My archery instructor is an NFAA National barebow champion (no release, no sights). He nails 60 yard bullseyes with boring regularity. When he hunts, he uses a release and sights. Makes you think ... eh?

If you get a bad hit on a deer with fingers, you'll wish you used your release! Do everything in your power to prevent wounded game.