The Skeeter FX 21 2013 is a modified-V design and the Skeeter WX 2100 2010 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.
On paper these two are close siblings in the size department - Skeeter FX 21 2013 at 20,8 ft versus Skeeter WX 2100 2010 at 21,0 ft. Weight tells a clearer story for trailering families: the Skeeter FX 21 2013 tips the scales at 2 175 lbs - 225 lbs more than the Skeeter WX 2100 2010 at 1 950 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 - 300 hp for the Skeeter FX 21 2013 and 300 hp for the Skeeter WX 2100 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. Fuel capacity breaks the other way: the Skeeter WX 2100 2010 carries 64 gallons versus 50 gallons in the Skeeter FX 21 2013. 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 Skeeter WX 2100 2010 is rated for 7 passengers, while the Skeeter FX 21 2013 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Skeeter WX 2100 2010 could be the deciding factor.
Bottom line: Choose the Skeeter WX 2100 2010 if your priority is putting more people on the water - it handles 7 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Skeeter FX 21 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.