I know it's best to go shoulder them and see which one is best and all, but outside of that - what criteria do you use to help you make a purchase?
You buy them all!
Yes shoulder them to see how they fit if possible. I find that in my "heart of hearts" I know which one I really want. So forget the advertising or what others may say they are not the one buying...buy what fits your needs and makes you happy.
You won't regret it.