Being a 1911 enthusiast, I don't like having to transition from DA to SA and I particularly dislike the Glock trigger. Although my groups when shooting a Glock aren't bad they do tend to string out horizontally a bit, where my 1911 groups tend to be round rather than linear.
As for sight picture, I prefer to have a front sight that has ample room in the notch of the rear sight, yet is still wide enough that you can see detail on the face of the ramp. When you focus on the front sight and the rear sight blurs slightly, so a front sight wide enough to fill or nearly fill the rear notch makes keeping the front sight centered in the notch without shifting your focus back to the rear sight difficult. If your focus shifts back to the rear sight, your group will enlarge, or it will take more time to get the shot off as you shift you focus back to the front sight.
IMHO, in order to shoot a Glock well means that you must shoot it a lot, ignoring other gun types until it has been mastered. If I was mandated to carry a Glock, I would have to spend a great deal of time on the range before I developed a comfort level with it, and the biggest reason for that is the trigger.