The Marathon DN B14SST 2009 is a modified-V design and the Marathon Otisco 1236 2011 is a flat-bottom design, so you're likely deciding between two noticeably 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 B14SST 2009 at 14,0 ft versus Marathon Otisco 1236 2011 at 12,0 ft. Weight tells a clearer story for trailering families: the Marathon DN B14SST 2009 tips the scales at 314 lbs - 204 lbs more than the Marathon Otisco 1236 2011 at 110 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 - 25 hp for the Marathon DN B14SST 2009 and 7 hp for the Marathon Otisco 1236 2011. 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.
For family outings this is probably the sharpest distinction between the two. The Marathon DN B14SST 2009 is rated for 5 passengers, while the Marathon Otisco 1236 2011 caps at 3. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Marathon DN B14SST 2009 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Marathon DN B14SST 2009 comes in at 13 lbs per hp versus 16 lbs per hp for the Marathon Otisco 1236 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.
Bottom line: Choose the Marathon DN B14SST 2009 if your priority is putting more people on the water - it handles 5 passengers and at 14,0 ft it has the deck room to back that rating up comfortably. The Marathon Otisco 1236 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 3 that costs less to run day-to-day.