every pumped muscular guy i see at my gym never uses full range of motion, always contracting the muscles with 8 - 12 reps, resting very little between sets <super sets, drop sets etc>. every big, but fat guy i see at the gym does about 5 - 8 reps, slowly, full range of motion with 3 - 5 minutes of rest between sets.
To me it seems the big fat guy will always be able to lift more weight, be the best bouncer in the world, but run a 15 minute mile. The muscular ripped guy looks like he could play any sport he wants above average, and run a 7 minute mile.
I think it all just boils down to what do you want to be?