Both the Sundance FX25 2013 and the Sundance K16FLX 2010 are modified-V designs, both built in fibreglass, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
Size is the most obvious dividing line here. The Sundance FX25 2013 measures 24,9 feet overall (2013), giving it roughly 9,2 additional feet of deck space compared to the Sundance K16FLX 2010 at 15,8 feet (2010). Weight tells a clearer story for trailering families: the Sundance FX25 2013 tips the scales at 2 600 lbs - 1 920 lbs more than the Sundance K16FLX 2010 at 680 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 Sundance FX25 2013 has a 260-hp advantage over the Sundance K16FLX 2010's 40-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sundance FX25 2013 carries 75 gallons versus 10 gallons in the Sundance K16FLX 2010. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Sundance FX25 2013 is rated for 10 passengers, while the Sundance K16FLX 2010 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sundance FX25 2013 could be the deciding factor.
Bottom line: Choose the Sundance FX25 2013 if your priority is putting more people on the water - it handles 10 passengers and at 24,9 ft it has the deck room to back that rating up comfortably. The Sundance K16FLX 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.