in most cases a wing/hydrofoil will give you less top end
it will get you up on plane quickly if your boat has a problem doing that
and it will stop porpoising
the right SS proper can make a big difference, when I changed mine it gave me 5 mph more top end
if you hit wood/stump with an aluminum prop you bend/break the prop, with SS prop you will break the wood
if you hit a rock with an aluminum prop you break the prop
with SS prop you break the prop and maybe the lower unit........