I'm going to buy a used boat shortly (aluminum fishing boat). Not sure what is best for me, an outboard or i/o? Looking for a 19' to 21' Alumaweld type boat, will be used mostly in bay and rivers (not whitewater). I've always preferred outboards, but alway had smaller boats. The price of the bigger outboards seems to make me consider an i/o? Any thoughts or suggestions? Thanks.