Both the Princecraft Brio 15 2012 and the Princecraft Vectra 21 2013 are pontoon designs, both built in aluminium, 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 Princecraft Vectra 21 2013 measures 21,5 feet overall (2013), giving it roughly 6,4 additional feet of deck space compared to the Princecraft Brio 15 2012 at 15,1 feet (2012). Weight tells a clearer story for trailering families: the Princecraft Vectra 21 2013 tips the scales at 1 704 lbs - 600 lbs less than the Princecraft Brio 15 2012 at 1 104 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 115 hp, the Princecraft Vectra 21 2013 has a 100-hp advantage over the Princecraft Brio 15 2012's 15-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Princecraft Vectra 21 2013 is rated for 10 passengers, while the Princecraft Brio 15 2012 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Princecraft Vectra 21 2013 could be the deciding factor.
Bottom line: Choose the Princecraft Vectra 21 2013 if your priority is putting more people on the water - it handles 10 passengers and at 21,5 ft it has the deck room to back that rating up comfortably. The Princecraft Brio 15 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.