Matching a pontoon Marathon Grumman Classic 1980E 2011 against a modified vee Marathon Seneca 14RDS 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.
Size is the most obvious dividing line here. The Marathon Grumman Classic 1980E 2011 measures 19,0 feet overall (2011), giving it roughly 4,7 additional feet of deck space compared to the Marathon Seneca 14RDS 2012 at 14,3 feet (2012). Weight tells a clearer story for trailering families: the Marathon Grumman Classic 1980E 2011 tips the scales at 2 015 lbs — 1 782 lbs more than the Marathon Seneca 14RDS 2012 at 233 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 — 10 hp for the Marathon Grumman Classic 1980E 2011 and 25 hp for the Marathon Seneca 14RDS 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.
For family outings this is probably the sharpest distinction between the two. The Marathon Grumman Classic 1980E 2011 is rated for 6 passengers, while the Marathon Seneca 14RDS 2012 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Marathon Grumman Classic 1980E 2011 could be the deciding factor.
Bottom line: Choose the Marathon Grumman Classic 1980E 2011 if your priority is putting more people on the water — it handles 6 passengers and at 19,0 ft it has the deck room to back that rating up comfortably. The Marathon Seneca 14RDS 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.