The Glock is objectively a better pistol. Glocks are not for everyone. I found the trigger annoying, and the aesthetics are just plain gross. I do acknowledge it's the better-designed firearm, but I don't buy things that don't make me feel happy. And Glocks don't.
I've owned about six 1911s and just one Glock 21, which I sold. So I'm biased.
I think it comes down to which one you'll shoot better, most likely, in terms of grip angle and trigger. Carry might also be a factor: the thinness of the 1911 vs the G21 is a definite consideration in that regard.