Seriously considering making the investment and have limited it down to these two choices to support my sponsors. For those of you with experience in 9mm with either or both platforms, I would greatly appreciate your insight and benefits of either platform. I primarily shoot 3G but dabble in USPSA, Steel Challenge and other shooting disciplines. I was fortunate enough to have a premier STI dealer at my vacation destination and was able to handle both. Other than the magwells and slide milling, what else am I missing between the two?