I have used a Tru Ball Boss X (Thumb/caliper head)for quite a few years now as my main release .. it has a very crisp-clean release .. even in cold, I leave it on the loop until needed, wet weather it stays in the pocket or muff till needed... my back-up is a Tru Ball Chappy with Talon head, also a thumb with a crisp clean release ..... Ive been looking at getting a Stan Perfex Long Neck Resistance, as it can be used to practice with its set screw so it wont fire, great for holding and visualizing the shot till it goes off, but dont 'fire' .. great training release ... Stan also does a thumb that does the same so you can practice but not fire ... you can hook it on the loop as it has a 'keeper' under the hook to keep it on the loop ... since I already have two excellent 'thumb' releases, I'm leaning towards the resistance style ... I did use the wrist strap a few times last season, first time in many years, I killed a 'yote and a 120lb Doe using it, the 205lb 8pt was killed using the Boss X,   I still prefer the thumb styles over the wrist .....