When two boats share the same hull type — in this case both the Formula 31 Cruiser 2009 and the Formula 310 Sun Sport 2012 are deep 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 — Formula 31 Cruiser 2009 at 31,0 ft versus Formula 310 Sun Sport 2012 at 31,0 ft. Weight tells a clearer story for trailering families: the Formula 310 Sun Sport 2012 tips the scales at 975 lbs — 834 lbs less than the Formula 31 Cruiser 2009 at 141 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.

Both boats are rated for 9 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.