Yeah I meant Amita or Hustler. I think I'll stick to aluminum unless I start tearing up some. In three years I've spun a hub and tore up one aluminum prop. The Black Diamond seems to work well but I want to go from a 13p to a 15p and thought about trying another brand.
I'm with you in sticking with aluminum. I've bent two Alpha prop shafts taking a hit with SS props. I've taken similar hits with aluminum and been able to limp home, with a straight prop shaft. It seems the aluminum blades are a better fuse than the hub.
I have a Turning Point 21 P, and it works fine. But I tend to stick with Michigan Wheel and their pressed in hubs. Hub kit + prop costs more than a pressed in hub prop. True that the replacement props are less expensive if you have the hub kit, but then you are married to that brand.
Are you sure your boat will perform satisfactorily going from 13p to 15?. Generally higher WOT speed and lower rpm, but your hole shots may be disappointing. Also if you pitch too high, you can overload your engine.
Don't worry about hub systems as harringtondav said, if you have the square hub system, it is compatible with Mercury, Solas, Turning Point, and Michigan Wheel. I actually have a Solas hub with my Turning Point prop, because I wanted a rubber hub instead of the composite that TP offers.
I had hub kit props from two different manufacturers. Each stated to only use their hub kit or risk damage, etc. Apparently I got bamboozled by their attempts to keep me in their fold.
Opening several Turning Point props last season revealed their Quality control leaves a bit to be desired.
They do make a 4 blade prop with two different shapes of blades. I have not tried that one.
Both the Mercury black diamond and the Solas aluminum props are standard props. The TP Hustler has more rake and will give higher performance, if your boat can utilize it.
What size boat and HP are you planning to install the prop on?
Unlike some others, all I run is Hustlers. They give great performance and I have seen or experienced zero defects.
They do make a 4 blade prop with two different shapes of blades. I have not tried that one.