You need to realize that if you take 2 equal engines, one turbo, one supercharged.
Both systems are made to make lets say 15psi.
The supercharger will make 5 psi @ 2500rpm, 10psi @5000rpm, and 15@6500rpm.
The turbo will make probably ~10psi @2500rpm, 15psi by 3k, and it will hold 15 psi...