It must be an individual perception. I think the Commander's balance is just great. But I can't fathom a Glock. I think Glocks are good pistols, but every one I have tried is just wrong for me. I also find nothing to complain about on the SIGs, but others have said they are top heavy or something which I can't see or feel.
I love my lightweight LT Colonel from PARA USA, the balance is perfect for me with the alloy frame and it's a joy to carry at just over 32 ounces loaded with 230 JHP. I'll probably keep if for the rest of my life.
I was one of the folks who said that Sigs are a bit slide heavy but after running a few hundred rounds through my daughters, I'm kinda singing a different tune. Loaded with 14 rounds of 9mm, it's balance is perfect!
