Get both. Really.
I've had my 1911 (actually, a Colt Officer's model, slightly smaller than the 1911 design) for a few years and it has served me well. It shoots very well, turning in decent groups at 25 & 50 yards (which is probably longer range than I'd ever really use it). It had one minor problem when I got it; the clip release latch hadn't been ground properly and would not hold a clip in when fired. Nothing that couldn't be fixed rather easily.
I just got my first Glock, a model 27 (.40 S&W caliber) yesterday. As far as accuracy, I can't really tell you how good it is, but I put 50 through it today and shot a nice 2" group at about 15 yards with 4 shots, plus one flyer (my fault, of course). The gun performed flawlessly, but most really do. It fits the hand well, particularly after I added a Pierce grip extender to one of the clips.
The Glock has now replaced my Colt auto as the home defense weapon. My Colt is just too nice looking to want to put it through severe duty, so I switched to the Glock. Besides, this model of Glock is small enough to fit where the Colt just wouldn't go, which is why I bought it. I really wanted a Glock 30 or 36, but it was exactly 1/2" too long, so I got the next best thing (I think).
Tom