I have owned maybe 20 Glocks over the years. I started out with the G19 in 1988. Then when the 40 caliber came out, I waited to see if the new cartridge would take in the market. Bought G23's and 27's. Then decided the 9mm was the best cartridge for me, for the same reasons that many others have posted. Tried a couple of G17's and G26's, but went back to the G19.
When the 3rd generation frames came out, tried a couple of 17's again. Then finally went back to the G19. Full circle, albeit in 3rd generation form. So my choice in this poll was easy .... the G19. I love the G19 so much, I currently have four, all 3rd gen.