When two boats share the same hull type — in this case both the Larson 186 Senza 2010 and the Larson LX 860 SF O/B 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?

On paper these two are close siblings in the size department — Larson 186 Senza 2010 at 18,5 ft versus Larson LX 860 SF O/B 2012 at 18,5 ft. Weight tells a clearer story for trailering families: the Larson LX 860 SF O/B 2012 tips the scales at 178 lbs — 151 lbs less than the Larson 186 Senza 2010 at 27 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 270 hp, the Larson 186 Senza 2010 has a 120-hp advantage over the Larson LX 860 SF O/B 2012's 150-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 186 Senza 2010 carries 29 gallons versus 3 gallons in the Larson LX 860 SF 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 186 Senza 2010 is rated for 9 passengers, while the Larson LX 860 SF O/B 2012 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Larson 186 Senza 2010 could be the deciding factor.