The Starcraft Marine 1648 2010 is a flat-bottom design and the Starcraft Marine Starliner 276 2011 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 Starliner 276 2011 measures 27,3 feet overall (2011), giving it roughly 11,3 additional feet of deck space compared to the Starcraft Marine 1648 2010 at 16,0 feet (2010). Weight tells a clearer story for trailering families: the Starcraft Marine Starliner 276 2011 tips the scales at 2 750 lbs - 2 450 lbs less than the Starcraft Marine 1648 2010 at 300 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.
The power gap is worth calling out. Rated to 225 hp, the Starcraft Marine Starliner 276 2011 has a 190-hp advantage over the Starcraft Marine 1648 2010's 35-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Starcraft Marine Starliner 276 2011 is rated for 16 passengers, while the Starcraft Marine 1648 2010 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 Starliner 276 2011 could be the deciding factor.
Bottom line: Choose the Starcraft Marine Starliner 276 2011 if your priority is putting more people on the water - it handles 16 passengers and at 27,3 ft it has the deck room to back that rating up comfortably. The Starcraft Marine 1648 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.