When two boats share the same hull type — in this case both the Sundance F19FLX 2010 and the Sundance NX17 2012 are modified vee designs with fiberglass construction — 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?
On paper these two are close siblings in the size department — Sundance F19FLX 2010 at 18,8 ft versus Sundance NX17 2012 at 17,2 ft. At 112 lbs and 135 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 — 70 hp for the Sundance F19FLX 2010 and 90 hp for the Sundance NX17 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. Fuel capacity breaks the other way: the Sundance NX17 2012 carries 29 gallons versus 24 gallons in the Sundance F19FLX 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 F19FLX 2010 is rated for 6 passengers, while the Sundance NX17 2012 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sundance F19FLX 2010 could be the deciding factor.
Bottom line: Choose the Sundance F19FLX 2010 if your priority is putting more people on the water — it handles 6 passengers and at 18,8 ft it has the deck room to back that rating up comfortably. The Sundance NX17 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.