Matching a flat Marathon Otisco 1236 2009 against a modified vee Marathon Seneca 16 2010 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.
Size is the most obvious dividing line here. The Marathon Seneca 16 2010 measures 16,0 feet overall (2010), giving it roughly 4,0 additional feet of deck space compared to the Marathon Otisco 1236 2009 at 12,0 feet (2009). Weight tells a clearer story for trailering families: the Marathon Seneca 16 2010 tips the scales at 301 lbs — 290 lbs less than the Marathon Otisco 1236 2009 at 11 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.
The Marathon Seneca 16 2010 tops out at 40 hp. Engine specs for the Marathon Otisco 1236 2009 aren't listed — confirm with a dealer before selecting an outboard.
For family outings this is probably the sharpest distinction between the two. The Marathon Seneca 16 2010 is rated for 7 passengers, while the Marathon Otisco 1236 2009 caps at 3. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Marathon Seneca 16 2010 could be the deciding factor.
Bottom line: Choose the Marathon Seneca 16 2010 if your priority is putting more people on the water — it handles 7 passengers and at 16,0 ft it has the deck room to back that rating up comfortably. The Marathon Otisco 1236 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 3 that costs less to run day-to-day.