If it was a Glock, it would probably be .45 ACP. I am unaware of any Glocks chambered in .45 Colt.
I have weapons of both those calibers and I like them both a lot.
I really like hand-loading for my .45 Colt Ruger old-style Vaquero. It’s stout enough that I can do up some hot loads that get near-44 magnum velocities with a 250 grain slug.
And, while I mean no offense to my beloved 1911s, my new FNX is simply the best .45 ACP weapon I have ever fired.
There’s nothing like a SAA for pure fun, and nothing like a SIG for social purposes. But the FNX looks nice too; Haven’t shot it, will have to give it a try.