I have not shot the Glocks, but the two pistols I shoot the most are a 1911 and a 92FS. Much to my shame, I shoot the Beretta better than the 1911. I do not have large hands, and the Beretta grips well for me.
The Beretta is a fine hand-gun, and I have to take the word of about a thousand police departments that the Glocks are as well. I would buy the one that was the most natural and comfortable to point; something you can do in the shop.
"It is better to be too skeptical then too credulous"