Both the Starcraft Marine 2310 IO 2008 and the Starcraft Marine SL 14 2013 are modified-V designs, the first built in fibreglass and the second in aluminium, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
Size is the most obvious dividing line here. The Starcraft Marine 2310 IO 2008 measures 20,0 feet overall (2008), giving it roughly 6,2 additional feet of deck space compared to the Starcraft Marine SL 14 2013 at 13,8 feet (2013). Weight tells a clearer story for trailering families: the Starcraft Marine 2310 IO 2008 tips the scales at 2 550 lbs - 2 420 lbs more than the Starcraft Marine SL 14 2013 at 130 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 - 6 hp for the Starcraft Marine 2310 IO 2008 and 15 hp for the Starcraft Marine SL 14 2013. 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.
For family outings this is probably the sharpest distinction between the two. The Starcraft Marine 2310 IO 2008 is rated for 12 passengers, while the Starcraft Marine SL 14 2013 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Starcraft Marine 2310 IO 2008 could be the deciding factor.
Bottom line: Choose the Starcraft Marine 2310 IO 2008 if your priority is putting more people on the water - it handles 12 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Starcraft Marine SL 14 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.