RE: Backtension release
Another point to note is that you can use back tension to set off trigger style releases. There are pro's that use back tension with both styles of releases and I am sure it would be a heated debate as to which is better. IMHO what is better is what works for you.
To really mix things up I know of a World ranked FITA shooter that uses a trigger style release for competition and a back tension for hunting. Go figure.