I experimented with a paddle holster for a time and, while it was quite comfortable, it was just to bulky to be easily concealable. The two best belt holster types that I've found are pancake-style holsters for small-to-medium guns as they have a very flat profile and Askins-style holsters for medium-to-large handguns because, while a bit bulkier, they do a better job of tucking the butt of the gun in close to the body.
Smith, and Wesson, and Me. -H. Callahan
Well waddaya know, one buwwet weft! -E. Fudd
All bad precedents begin as justifiable measures. -J. Caesar