A couple of things
Alphas have the impeller in the out-drive, bravos have the impeller running off the engine belt. By putting the pump on the engine and not in the out-drive, maintenance becomes so much easier. You can then put a strainer inline to help prevent marine gunk from getting into the engine and winterizing the becomes literally a 5 minute affair. Also, the Bravos are a stronger built engine that can support more horsepower and abuse. A stainless steel prop on an alpha is begging for trouble, one rock or sandbar and that unit is going to have lots of broken issues. If it has a 305 or smaller, an alpha is fine, but 350 or more, go with a bravo.
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