I/O or OB power? Need feedback ASAP

I've decided to try a V-20 for the next few years in waters on and around Nantucket. Have a choice of 2 creampuffs. Not having owned and run an I/O in ocean waters before I'm really giving primary consideration to the OB version @ 200 hp. It has an open deck w. only a helm seat; plenty of move-around space. The I/O of course uses deck space w. the doghouse and there's a back-to-back passenger seat on a storage box.

If one considers both boats and their propulsion systems equal in condition etc., but shorter $ to buy the I/O boat, I think my decision would be base on the weight difference aft between the 2. Any educated thoughts about this "dilemma"???