When two boats share the same hull type — in this case both the Larson LX 620 O/B 2012 and the Larson SEi 180 Sport I/O 2006 are modified vee designs with composite 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?

On paper these two are close siblings in the size department — Larson LX 620 O/B 2012 at 16,2 ft versus Larson SEi 180 Sport I/O 2006 at 17,0 ft. Weight tells a clearer story for trailering families: the Larson SEi 180 Sport I/O 2006 tips the scales at 2 365 lbs — 2 250 lbs less than the Larson LX 620 O/B 2012 at 115 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 LX 620 O/B 2012 carries a rated maximum of 90 hp. Engine data for the Larson SEi 180 Sport I/O 2006 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.Fuel capacity breaks the other way: the Larson SEi 180 Sport I/O 2006 carries 23 gallons versus 19 gallons in the Larson LX 620 O/B 2012. 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 LX 620 O/B 2012 is rated for 6 passengers, while the Larson SEi 180 Sport I/O 2006 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Larson LX 620 O/B 2012 could be the deciding factor.