P11 is quite a bit bigger, heavier trigger but will handle limited amount of 9mm+p. Think wt is around 14 oz empty vs 8 oz for p3at. You can get 10rd or 12 rd mags for P11 vs 6rd mag for p3at. Both conceal well but P11 is more IWB carry vs pocket carry for p3at. P11 hardest pistol I ever owned to shoot accurate but after 3 years, trigger has lightened up some.