A SS prop is more efficient in the water. The prop guys can give the science behind it, but I know this to be true. I have had both on other boats. With my tiller, the aluminum had far less torque on my arm and I used that one on rougher days, or days when I had a full load. But most of the time I ran the SS. Never had issues with my LU because of hitting things, and I've kissed the bottom a few times. I have busted up some aluminum one's on my old boat though.
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