Well, with a 125 grain bullet and using standard factory ammo, both exceed 500 ft lbs out of 4" guns. That doesn't tell the tale for me of course. I can get 662 ft lbs out of a 2.3" SP101 using 180 grain bullets and my 140 grain carry loads pack as much punch as that 4" Sig when fired out of my SP101. I prefer the magnum round for its versatility, but then, I'm a revolver NUT to begin with. But, I hunt with and carry the .357 magnum. It's one of my favs. I'll probably never own a .357 Sig. Anything it will do, the .40 S&W will do far as self defense goes. I never really saw the point of the Sig other than marketing to departments that had been using the magnum for years. That don't mean it ain't a good round, though, and some prefer bottle neck rounds for reliable feeding which is valid IMHO, though I don't have any feeding problems with my 9s and .45ACP.