When two boats share the same hull type — in this case both the Supra Sunsport 20 V 2008 and the Supra Sunsport 21V 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?
Size is the most obvious dividing line here. The Supra Sunsport 21V 2012 measures 21,3 feet overall (2012), giving it roughly 19,3 additional feet of deck space compared to the Supra Sunsport 20 V 2008 at 2,0 feet (2008). At 32 lbs and 38 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 — 340 hp for the Supra Sunsport 20 V 2008 and 325 hp for the Supra Sunsport 21V 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. Both carry nearly identical fuel loads — 4 gal and 5 gal — so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Supra Sunsport 21V 2012 is rated for 14 passengers, while the Supra Sunsport 20 V 2008 caps at 1. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Supra Sunsport 21V 2012 could be the deciding factor.
Bottom line: Choose the Supra Sunsport 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 20 V 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 1 that costs less to run day-to-day.