Agree with this, all three you mentioned are reliable striker fired guns with very different grip feels. The legion will be the heaviest so potentially the least perceived recoil, and you can get a *thumb rest [generic]*. Glocks are widely used with huge aftermarket. The p10 is fairly new and competing against the well established DA/SA shadow and shadow 2 but it has great ergonomics and you can stuff weights into the backstrap and the stock mag holds 19 without an extended basepad. Personally, I have a p10f and like it, but I still had my shadow 2 milled and am using that in CO now (was already shooting shadow 1/2 in production).