The Marathon Grumman Classic 1680CFP 2012 is a pontoon design and the Marathon Oneida 16 2010 is a modified-V 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 Grumman Classic 1680CFP 2012 at 16,0 ft versus Marathon Oneida 16 2010 at 16,0 ft. Weight tells a clearer story for trailering families: the Marathon Grumman Classic 1680CFP 2012 tips the scales at 1 460 lbs - 950 lbs more than the Marathon Oneida 16 2010 at 510 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 - 40 hp for the Marathon Grumman Classic 1680CFP 2012 and 50 hp for the Marathon Oneida 16 2010. 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 1680CFP 2012 is rated for 6 passengers, while the Marathon Oneida 16 2010 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 1680CFP 2012 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Marathon Oneida 16 2010 comes in at 10 lbs per hp versus 37 lbs per hp for the Marathon Grumman Classic 1680CFP 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: Choose the Marathon Grumman Classic 1680CFP 2012 if your priority is putting more people on the water - it handles 6 passengers and at 16,0 ft it has the deck room to back that rating up comfortably. The Marathon Oneida 16 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.