I don't have experience with either but I've been here long enough to know you'll probably be asked all kinds of application questions like: what size boat and powerplant, what is your intended purpose for the boat, what do you want the boat to do, do you just want static thrust as in most thrust while stuck in a sticky spot or do you want top end. One of the props might give you better thrust standing still but not have the top end of the other and vice versa. If you can answer these you'll get better answers for your perticular situation. Oh yeah I almost forgot, WELCOME ABOARD !