When two boats share the same hull type — in this case both the Larson 180 Sport 2009 and the Larson 310 Cabrio 2010 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 14,0 additional feet of deck space compared to the Larson 180 Sport 2009 at 17,0 feet (2009). Weight tells a clearer story for trailering families: the Larson 180 Sport 2009 tips the scales at 2 375 lbs — 2 271 lbs more 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 Larson 310 Cabrio 2010 tops out at 320 hp. Engine specs for the Larson 180 Sport 2009 aren't listed — confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Larson 180 Sport 2009 carries 23 gallons versus 16 gallons in the Larson 310 Cabrio 2010. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

The Larson 180 Sport 2009 is rated for up to 8 people. Passenger data for the Larson 310 Cabrio 2010 wasn't available.