Given that the "platform" is the same between your duty gun and the M&P Pro, and the shooting process is identical between the two (ie, no safety and similar trigger feel, grip size, grip angle, mag release etc etc.) I think that the M&P is the best choice. Let's face it, under the threat of being killed you won't notice a 2 pound trigger pull difference, or feel an increase in recoil. I also agree with Jason though, nothing wrong with shooting IPSC with your duty rig. Also I'd suggest giving a PPC Duty Pistol match a try, you'll need a duty rig to compete as there's a Level 2 minimum and a stock pistol works just fine, all forms of competition make you a better shooter.