Both the Supra Launch 21V 2012 and the Supra Sunsport 20V 2012 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?
On paper these two are close siblings in the size department - Supra Launch 21V 2012 at 21,3 ft versus Supra Sunsport 20V 2012 at 20,7 ft. Weight tells a clearer story for trailering families: the Supra Launch 21V 2012 tips the scales at 3 800 lbs - 700 lbs more than the Supra Sunsport 20V 2012 at 3 100 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 - 325 hp for the Supra Launch 21V 2012 and 325 hp for the Supra Sunsport 20V 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 Supra Launch 21V 2012 carries 50 gallons versus 39 gallons in the Supra Sunsport 20V 2012. 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 Supra Launch 21V 2012 is rated for 14 passengers, while the Supra Sunsport 20V 2012 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Supra Launch 21V 2012 could be the deciding factor.
Bottom line: Choose the Supra Launch 21V 2012 if your priority is putting more people on the water - it handles 14 passengers and at 21,3 ft it has the deck room to back that rating up comfortably. The Supra Sunsport 20V 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 10 that costs less to run day-to-day.