Up until a couple of years ago, before I got my CHL, I'd have said the Colt no question. If I were to strictly shoot on the range with no carry, the 1911 is more fun and esaier for me to shoot. Now that I have my CHL though, I'd say the G19.
I have a SA champion GI that shoots great and I love. I recently picked up my first Glock, a G19. I have Milt Sparks VMII's for both and a Beltman belt. I much prefer carrying the G19, simply because of the weight issue. For some reason, once I get a gun above about 25oz, I just don't like it on my belt. I shoot both equally well. I like the feel of the 1911 much better, and of course it's .45. But the weight and capacity favors the G19.
Glad I don't have to have just one. My G36, PM9, and 3AT get all my carry duty now though.