When two boats share the same hull type — in this case both the Sun Tracker Party Barge 21 2010 and the Sun Tracker Party Barge 22 Regency Edition 2009 are pontoon designs with aluminum 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?

On paper these two are close siblings in the size department — Sun Tracker Party Barge 21 2010 at 21,0 ft versus Sun Tracker Party Barge 22 Regency Edition 2009 at 24,0 ft. Weight tells a clearer story for trailering families: the Sun Tracker Party Barge 21 2010 tips the scales at 1 873 lbs — 1 870 lbs more than the Sun Tracker Party Barge 22 Regency Edition 2009 at 3 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 135 hp, the Sun Tracker Party Barge 22 Regency Edition 2009 has a 45-hp advantage over the Sun Tracker Party Barge 21 2010's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 42 gal and 45 gal — so range won't be a tiebreaker here.

For family outings this is probably the sharpest distinction between the two. The Sun Tracker Party Barge 22 Regency Edition 2009 is rated for 14 passengers, while the Sun Tracker Party Barge 21 2010 caps at 11. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sun Tracker Party Barge 22 Regency Edition 2009 could be the deciding factor.