The three blade is more weedless than the two blade. It has shorter, sharper blades and has a tapered hub. That's all meant for chopping up weeds and keeping them from wrapping around your trolling motor.
The basic rule of thumb is to get the 3 blade if you're fishing weedy areas, and a two blade if you're not in the weeds.
I keep one of each, and swap them out as the water conditions dictate.
It's a wise move to keep a spare in the boat anyway. A busted TM prop with no spare can ruin an entire trip to the lake.



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