Matching a flat Marathon Otisco 1436 2012 against a modified vee Marathon Seneca Utility 13 2009 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 Otisco 1436 2012 at 14,1 ft versus Marathon Seneca Utility 13 2009 at 13,0 ft. At 13 lbs and 15 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.
Both boats share a closely matched power ceiling — 15 hp for the Marathon Otisco 1436 2012 and 15 hp for the Marathon Seneca Utility 13 2009. 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 Seneca Utility 13 2009 is rated for 4 passengers, while the Marathon Otisco 1436 2012 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 Utility 13 2009 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Marathon Otisco 1436 2012 comes in at 1 lbs per hp versus 1 lbs per hp for the Marathon Seneca Utility 13 2009. 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 Seneca Utility 13 2009 if your priority is putting more people on the water — it handles 4 passengers and at 13,0 ft it has the deck room to back that rating up comfortably. The Marathon Otisco 1436 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 3 that costs less to run day-to-day.