Everything depends on YOUR body shape, and your choice of holster. With a a belt holster, probably the aluminum-frame Commander size is best, and a bobbed mainspring housing might help, although I have not found it necessary. With IWB carry, results may be different. I have found a full-length Government Model in a Milt Sparks Summer Special to be MORE comfortable than a Commander, whose muzzle digs into my butt at about 4:00 o'clock. Bobbed housing still not necessary. With IWB, particularly with jeans, the weight of a steel (stainless steel, in my case) Gov't Model is inconsequential. The SS Gov't Model in the Summer Special is the one rig I know I can rely on to be comfortable all day, even if the day is long.
Your results may well vary. BTW, the fit, both to gun and body, of the Summer Special will not end up how it started out. After it has been used a while and sweated on a lot, it will fit the gun better. In my case, it fit the body better, also, and I wouldn't be surprised if that is true in all cases, since the leather is thick, and a 1911 doesn't have many protrusions, anyway.
Good luck!