I'm sure lots of people have exerience with both. For me, several Mercruiser's, Volvo's, Yamaha's, a Mercury and Johnson... I still own part of an Volvo I/O boat attached, and have several outboards (Yamaha). Yes, outboards are easy to winterize, tilt down...done... well you can run the fuel out, fog, etc if you want... - it takes an hour or so with an I/O - to drain water, change oil. If your camping and fishing in the early spring or fall, freezing is a concern with an I/O.... easily solved by leaving it in the water over night. If its in your yard put a light bulb or small heater in the engine area - no worries....
Saltwater corrosion is a problem with I/O's - outboards rise all the way out of saline salt water.... but we don't have much salt water here in Colorado.
An I/O is said to be more fuel efficent... maybe than an "old" 2 stroke outboard, but even my big 2 stroke yamaha is pretty good,,, comparable to an I/O.
In my experience I/O's are heavier... maybe less hole shot compared to a 2 stroke outboard of equivalent power...
So in a nut shell - they are both pretty good, if it gets you on the water - runs well ??