The Lund 1648 2010 is a flat-bottom design and the Lund 2150 Baron 2005 is a modified-V 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 Lund 2150 Baron 2005 measures 21,0 feet overall (2005), giving it roughly 5,2 additional feet of deck space compared to the Lund 1648 2010 at 15,8 feet (2010). Weight tells a clearer story for trailering families: the Lund 2150 Baron 2005 tips the scales at 2 285 lbs - 1 865 lbs less than the Lund 1648 2010 at 420 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 250 hp, the Lund 2150 Baron 2005 has a 215-hp advantage over the Lund 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 Lund 2150 Baron 2005 is rated for 10 passengers, while the Lund 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 Lund 2150 Baron 2005 could be the deciding factor.
Bottom line: Choose the Lund 2150 Baron 2005 if your priority is putting more people on the water - it handles 10 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Lund 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.