When two boats share the same hull type — in this case both the Jupiter 31 Cuddy 2010 and the Jupiter 38 Tournament 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?
Size is the most obvious dividing line here. The Jupiter 38 Tournament 2007 measures 38,0 feet overall (2007), giving it roughly 4,8 additional feet of deck space compared to the Jupiter 31 Cuddy 2010 at 33,2 feet (2010). At 105 lbs and 129 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 900 hp, the Jupiter 38 Tournament 2007 has a 200-hp advantage over the Jupiter 31 Cuddy 2010's 700-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Jupiter 38 Tournament 2007 carries 32 gallons versus 26 gallons in the Jupiter 31 Cuddy 2010. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
The Jupiter 31 Cuddy 2010 is rated for up to 10 people. Passenger data for the Jupiter 38 Tournament 2007 wasn't available.
Bottom line: The Jupiter 38 Tournament 2007 at 38,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Jupiter 31 Cuddy 2010 at 33,2 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.