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I know my Merc 90 has a shear pin to protect the prop but I have stayed with an aluminum prop. I fish in a lot of skinny water in NC and SC with a lot of oysters. I have hit oysters that would have broken a shear pin.
Instead of calling Boat US for a tow and missing a day or weekend of fishing I kept on going with an ugly prop and maybe a little vibration. Most of the time you don't even notice the cut or bend in a blade.
If I only fished in deep water or offshore I would use a stiffer stainless steel prop which would probably give me a 2-4 mph boost.