Depends on the application. If its for fishing I would get an outboard. It gives you a little more room in the boat. If its for competition I would choose an Inboard. They have more manuverabitliy. For a pleasure boat I would choose an I/O.Quieter and less smelly than an outboard. Less maintenance than an Inboard. I/O is overall the better choice for pleasure in my opinion, but every body has one.