Matching a flat Marathon DN 1436 Jon 2010 against a modified vee Marathon Seneca 12 2012 means you're likely deciding between two genuinely different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department — Marathon DN 1436 Jon 2010 at 14,1 ft versus Marathon Seneca 12 2012 at 11,7 ft. Weight tells a clearer story for trailering families: the Marathon Seneca 12 2012 tips the scales at 121 lbs — 108 lbs less than the Marathon DN 1436 Jon 2010 at 13 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 share a closely matched power ceiling — 15 hp for the Marathon DN 1436 Jon 2010 and 10 hp for the Marathon Seneca 12 2012. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.
Both boats are rated for 3 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 Marathon DN 1436 Jon 2010 comes in at 1 lbs per hp versus 12 lbs per hp for the Marathon Seneca 12 2012. 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.
Bottom line: The Marathon DN 1436 Jon 2010 at 14,1 ft is the right call if deck space, comfort, and entertaining are top of your list. The Marathon Seneca 12 2012 at 11,7 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.