I shoot both, and I own both. I actually have a GP 100 in 6" and 4". For some reason, I shoot the 6" better. I can shoot a revolver consistently further and further away than an auto pistol but that probably has to do more with the ballistics of a 357 Magnum versus a 9mm.
You didn't mention your distances, but I set up targets at 25 and 50 yards, routinely, though I have been working on 75 and 100 yards, for handguns to push myself. I shoot twice a week, on weekends, since the weekdays are too dark for me.
I think it's your level of comfort and familiarity with the Glock. The trigger is lighter on a Glock. Depending upon the sights of each system, you are also more comfortable with the sight picture of the Glock. It is also easier for most people to use a Glock or other striker fire pistol.
I definitely enjoy both. I only shoot in double action, personally, for both. I tend to shoot my revolver more accurately since I don't have a slide to cycle back and forth, so I can point more consistently and stay on target. I also personally reload my 357 Magnum cartridges so it is more accurate for me; whereas I'm at the whim for what the factory puts together for 9mm.
I have other Glocks, as well, and I shoot the Glock 30 the best of all Glocks. It is wider and easier to control. I do; however, have different sights on it compared to the others - a Truglo which has fiber optics, as well as Tritium. It took a long time to adjust to a Glock 42 because of its small size for me, so I definitely shoot a revolver better than that. My first Glock was a Glock 23 which I shoot well, but not as well as a Glock 30.
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