The Sea Fox 216DC 2009 is a modified-V design and the Sea Fox 240 Viper 2013 is a deep-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.
Size is the most obvious dividing line here. The Sea Fox 240 Viper 2013 measures 24,3 feet overall (2013), giving it roughly 3,3 additional feet of deck space compared to the Sea Fox 216DC 2009 at 21,0 feet (2009). Weight tells a clearer story for trailering families: the Sea Fox 240 Viper 2013 tips the scales at 3 300 lbs - 700 lbs less than the Sea Fox 216DC 2009 at 2 600 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 power gap is worth calling out. Rated to 300 hp, the Sea Fox 240 Viper 2013 has a 100-hp advantage over the Sea Fox 216DC 2009's 200-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sea Fox 240 Viper 2013 carries 90 gallons versus 60 gallons in the Sea Fox 216DC 2009. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Both boats are rated for 8 passengers - a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: The Sea Fox 240 Viper 2013 at 24,3 ft is the right call if deck space, comfort, and entertaining are top of your list. The Sea Fox 216DC 2009 at 21,0 ft wins on trailering ease, likely lower purchase price, and simpler docking - a solid choice for a buyer who wants more boat for less money.