When two boats share the same hull type — in this case both the Larson LX 620 O/B 2011 and the Larson SEi 180 Ski Fish O/B 2007 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 LX 620 O/B 2011 at 16,2 ft versus Larson SEi 180 Ski Fish O/B 2007 at 17,0 ft. At 115 lbs and 17 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.

The power gap is worth calling out. Rated to 150 hp, the Larson SEi 180 Ski Fish O/B 2007 has a 60-hp advantage over the Larson LX 620 O/B 2011's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 23 gal and 23 gal — so range won't be a tiebreaker here.

Both boats are rated for 6 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.

At this size, power-to-weight ratio matters more than outright horsepower. The Larson SEi 180 Ski Fish O/B 2007 comes in at 0 lbs per hp versus 1 lbs per hp for the Larson LX 620 O/B 2011. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.