The Sun Tracker Party Barge 21 2004 vs Sun Tracker Party Barge 25 2004 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.
On paper these two are close siblings in the size department - Sun Tracker Party Barge 21 2004 at 21,0 ft versus Sun Tracker Party Barge 25 2004 at 24,0 ft. Weight tells a clearer story for trailering families: the Sun Tracker Party Barge 25 2004 tips the scales at 2 220 lbs - 530 lbs less than the Sun Tracker Party Barge 21 2004 at 1 690 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.
For family outings this is probably the sharpest distinction between the two. The Sun Tracker Party Barge 25 2004 is rated for 14 passengers, while the Sun Tracker Party Barge 21 2004 caps at 13. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sun Tracker Party Barge 25 2004 could be the deciding factor.
Bottom line: Choose the Sun Tracker Party Barge 25 2004 if your priority is putting more people on the water - it handles 14 passengers and at 24,0 ft it has the deck room to back that rating up comfortably. The Sun Tracker Party Barge 21 2004 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 13 that costs less to run day-to-day.