My friend who's a full-time pro mechanic laughs at my Craftsman wrenches. He says they're too heavy and clunky. Says Snap-Ons are much lighter, easier on your hands when you're working with them all day. Says Craftsman stuff is so heavy so it will be harder to break, but in the process it often won't go into tight spots where Snap-on or equivalent will go.
His argument seems valid, but I'm not going to dispose of my Craftsman stuff and buy the much, much more expensive pro tools. I do, however, choose the good stuff when I'm buying from the second-hand tool store.