If I was considering an outboard and an IO of similar HP, I would go for the outboard. This is my opinion based on years of boating.
IOs supply unlimited HP and torque. They are much heavier size for size, they do get better gas mileage than most 2 strokes of similar HP and they burn straight gas. They are much more complicated than any 2 and 4 stroke outboard.
IOs have a motor connected to a lower unit by a drive shaft with universal joints covered by bellows that all
need replacing regularly and I think the shift and steering cable hang off the stern with bellows that also need replacing. There is a steering cable on an outboard but it is much better protected, the throttle and shift are almost carefree for an outboard.
Also an extra piece of safety equipment needed for an IO, you need to have a fire extinguisher on board that needs to be checked and filled if used.