The Starcraft Marine 1700 I/O 2010 is a modified-V design and the Starcraft Marine Starfish 256 2012 is a pontoon design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
Size is the most obvious dividing line here. The Starcraft Marine Starfish 256 2012 measures 26,8 feet overall (2012), giving it roughly 10,0 additional feet of deck space compared to the Starcraft Marine 1700 I/O 2010 at 16,8 feet (2010). Weight tells a clearer story for trailering families: the Starcraft Marine Starfish 256 2012 tips the scales at 2 575 lbs - 1 025 lbs less than the Starcraft Marine 1700 I/O 2010 at 1 550 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
Both boats share a closely matched power ceiling - 220 hp for the Starcraft Marine 1700 I/O 2010 and 200 hp for the Starcraft Marine Starfish 256 2012. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads - 23 gal and 24 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Starcraft Marine Starfish 256 2012 is rated for 14 passengers, while the Starcraft Marine 1700 I/O 2010 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Starcraft Marine Starfish 256 2012 could be the deciding factor.
Bottom line: Choose the Starcraft Marine Starfish 256 2012 if your priority is putting more people on the water - it handles 14 passengers and at 26,8 ft it has the deck room to back that rating up comfortably. The Starcraft Marine 1700 I/O 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.