I looked at them all and shot several rentals before making my purchase. Since I was looking at a lighter, more conceal friendly gun than my Beretta 92fs, I went with the Gen4 G19. I really like it.
Since then however, I had the opportunity to pick up a used Gen3 G30SF; now I carry the G30 every day. It's only slightly heavier than the 19 and slightly wider in the slide. Not much difference in grip length or slide length. And it's a .45!
All things considered, if I had to make the choice of one Glock and one Glock only, I would go with the G19 again. In the poll, I did choose the G30, I am just mixed up. I like them both.