The Princecraft 16 2004 vs Princecraft Vectra 21 2009 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Princecraft Vectra 21 2009 measures 21,5 feet overall (2009), giving it roughly 5,5 additional feet of deck space compared to the Princecraft 16 2004 at 16,0 feet (2004). Weight tells a clearer story for trailering families: the Princecraft Vectra 21 2009 tips the scales at 1 639 lbs - 711 lbs less than the Princecraft 16 2004 at 928 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 Princecraft Vectra 21 2009 tops out at 90 hp. Engine specs for the Princecraft 16 2004 aren't listed - confirm with a dealer before selecting an outboard.
For family outings this is probably the sharpest distinction between the two. The Princecraft Vectra 21 2009 is rated for 8 passengers, while the Princecraft 16 2004 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Princecraft Vectra 21 2009 could be the deciding factor.
Bottom line: Choose the Princecraft Vectra 21 2009 if your priority is putting more people on the water - it handles 8 passengers and at 21,5 ft it has the deck room to back that rating up comfortably. The Princecraft 16 2004 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.