I have had both, and OB is so much easier to work on, and much less maintenance!!
There is so many parts on a I/O and you are always working on something! Car motors should never see the ocean!!
OB pro: easier to maintain, easier to repair, easy to replace
Con: Nosier, more gas, if going new much more to replace
I/O Pro: great on gas, quite, cheaper to repower
Con: Lots to maintain, never stop replacing rusted parts, harder to work on as most are squeezed into a hole half the size of the motor
OB getting much better with noise, and gas, but with a price!! A 200 hp complete with install and set up is $15K at least, then you can't work on them any more!
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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