pretty sure the Springfield Armory "Champion" is a commander slide w/ officers frame, same with the Dan Wesson CCO
You'd be wrong then. I had a Springfield Champion, my first 1911. Its a 4" barrel on a full size frame.
To answer the OP's question, I've had the above mentioned Springer, a Kimber Pro Carry II, a 5" Kimber Royal, and now have a Commander size (4.25) Nighthawk bobtail and a 3" Colt on a lightweight Officer's frame. So I've run the gamut of size and frame material.
Yes, the Commander size is more comfortable, though not necessarily easier to conceal than the 5" 1911. The 5" will tend to move around more when seated and using an IWB holster. Because of their thin frame and slide, the 1911 is a very easy pistol to conceal, regardless of barrel length if you're using an IWB holster. Obviously with an OWB, the 5" is more likely to protrude below a cover garment. The 5" is the least
comfortable to carry of the 1911s.
Of course the secret to carrying a steel frame 1911 all day comfortably, is really no secret at all, you need a good holster and good, sturdy gun belt.
They make all the difference in the world.