WOW! if anyone could figure out which one holster would be perfect/best for every person in the world I'd think they would be sitting on a gold mine.

The short, simple answer is...There is no perfect holster for every person. You'll have to do your own research and experimentation and go from there.

A search on this forum of say "M&P9c holster" will net you a few dozen suggestions I'm sure. Go try that on google once and you'll have enough links to keep you busy for several months.