You have been tossing around the idea of repowering your trusty boat for some time but the same question keeps popping up. Two or four? Which is a good question to have for a number of reasons. But to get to the answer of that question, you should first know the difference between the two motors. They both have their advantages and disadvantages. Once you have a good understanding of them, it really comes down to what motor is the best for your application of use.