1911
Pro' s
A timeless classic. Battle proven around the world. Very durable, very reliable, very accurate. It also has the most after market accessories of any hand gun out there. It is very customizable. I have a custom 1911 in 10mm that is an awsome handgun.

Cons
They can be rather pricy and the cheaper ones sometimes need to be worked on to always feed flawlessly.

Glock
Pros
Very reliable, fairly accurage design. Inexpensive, and about indestructable. The GLocks come in a wide range of sizes and configurations to fit your needs. Some people also perfer to carry a loaded glock over a 1911 because they are afraid of the cocked and locked position of a 1911 hammer.

Cons
I personaly feel they are kind of ugly, blocky, mishapen things. They dn' t particularly fig my hand very well and I" m not that fond of their sites. THey are not as customizable as the 1911 style pistol either.