You will have your answer once you run the boat a few times, just check max rpm with all your gear and people on board. I run 3 blade stainless genuine suzuki props on my glacier bay and am more than happy with their performance. I might just get them tuned and balanced. my df140a suzukis spin up to 6100rpm at WOT
4 blades might give you slightly better cruise but less hole shot and less top end..