The Larson LX 185 S I/O 2013 is a deep-V design and the Larson LXi 258 I/O 2012 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 Larson LXi 258 I/O 2012 measures 25,5 feet overall (2012), giving it roughly 6,8 additional feet of deck space compared to the Larson LX 185 S I/O 2013 at 18,7 feet (2013). Weight tells a clearer story for trailering families: the Larson LXi 258 I/O 2012 tips the scales at 4 750 lbs - 2 710 lbs less than the Larson LX 185 S I/O 2013 at 2 040 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 300 hp, the Larson LXi 258 I/O 2012 has a 165-hp advantage over the Larson LX 185 S I/O 2013's 135-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Larson LXi 258 I/O 2012 carries 56 gallons versus 19 gallons in the Larson LX 185 S I/O 2013. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Larson LXi 258 I/O 2012 is rated for 12 passengers, while the Larson LX 185 S I/O 2013 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Larson LXi 258 I/O 2012 could be the deciding factor.
Bottom line: Choose the Larson LXi 258 I/O 2012 if your priority is putting more people on the water - it handles 12 passengers and at 25,5 ft it has the deck room to back that rating up comfortably. The Larson LX 185 S I/O 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.