Just as a counterpoint-
I disagree that there is an extreme difference in felt recoil between a 9mm and .45. Granted, the question is regarding Glock models, but I feel an insignificant recoil difference between a full-sized 1911 and a Glock 19. There are many other variables at play here including barrel length and the overall size of the handgun in question. For example, I feel more confident with placement from my 1911 than I do my .38 snubby. My wife, who has very small hands, can shoot tight groups with a Glock 22 but limp-wrists a 19 to the point where she simply cannot operate the handgun reliably.
But for an average sized adult male, I'm not sure felt recoil should be the determining factor in a choice between the significantly different performance characteristics of 9mm vs .45
The best advice given is to shoot a variety of models and calibers and find one you are most confident with. Getting advice is always good, and I am not suggesting you disregard any of the good advice you got here. Merely suggesting that advice is your starting point, rather than your decisioning point.