Who would be better to help you move? A professional body-builder, or a professional mover?

Body builders have a ton of muscle, and spend all their time lifting weights. But they are lifting weights in order to (mainly) look good. A professional mover spends all his time lifting and moving things, but doesn't worry about muscles that don't help with the tasks he normally does.

Put another way - are the muscles that super-ripped body builders have "useful" muscles, or are they mostly for show?