I bought my first two guns 38 and 37 years ago, respectively, and I still have both of them: A Colt 1911 Series 70, and a S&W M19. I'll probably never sell them. But I don't carry them. They come out of the safe and go to the range every now and then.
I had bad luck on my first Glock, got one that was tolerance stacked beyond help. That turned me off to the platform for several years, until I bought a well worn G19 gen 2 on a whim (and a good price), and that one runs nicely. If that had happened the first try who knows, maybe I never would have needed anything else. As it happened, that pushed me to H&K and I'm perfectly happy with my P2000's.
If I had to pick just one for carry, I'd be happy with either the P2000 or the G19. I've fairly recently started playing with a J-frame though, and more and more it feels like I always want one of those around too for the days when, for any of a variety of reasons, it's less than optimal to carry anything bigger.