When two boats share the same hull type — in this case both the Larson 310 Cabrio 2010 and the Larson LX 850 I/O 2012 are modified vee designs with fiberglass construction — 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 Larson 310 Cabrio 2010 measures 31,0 feet overall (2010), giving it roughly 12,6 additional feet of deck space compared to the Larson LX 850 I/O 2012 at 18,4 feet (2012). Weight tells a clearer story for trailering families: the Larson LX 850 I/O 2012 tips the scales at 245 lbs — 141 lbs less than the Larson 310 Cabrio 2010 at 104 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 320 hp, the Larson 310 Cabrio 2010 has a 185-hp advantage over the Larson LX 850 I/O 2012's 135-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 16 gal and 19 gal — so range won't be a tiebreaker here.