I'm trying to decide which Glock should be my next. It's either the 20 or 21, I want the big framed Glock. I really wanna buy the 20, basically based off some of the Double Tap ammo videos off Youtube, and to own what Glock claims is their most powerful handgun. I've also been considering the 21, based off of folks saying there's not much the modern .45 can't do ballistics wise compared to the 10mm. I need some feedback ASAP, I'm hoping to order it next week!!!!!!!!!