I don't have any experience with the 20, but i have been very happy with my 19. I have always owned Sigs, Beretta's or 1911's. I was looking for some thing smaller for summer carry and decided to give Glock a chance because of the length of barrel and sight radius length was much longer than most autos that came with larger outer dimensions. I feared a 5.5lbs. trigger because most of my training has been with a 3lb 1911 trigger. After a couple of mags through the Glock, I became quickly acquainted with the trigger. As far as I am concerned, you can't beat the unbelievable performance for your money.