Engine makes a huge difference in the prop selection process. Anything over 4.3 liters should really have a stainless steel prop, IMO. The torque that bigger engines make will flex the blades badly on an aluminum prop and make the boat feel mushy. Below 4.3 liters, there's not a big advantage to stainless steel. I suggest not hitting rocks no matter what you choose. I would get the damaged prop repaired by a local welder (cheaper than a prop shop) and use it as a spare.
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