The Sun Tracker PARTY BARGE 17 Signature Series 2005 vs Sun Tracker Party Deck 21 I/O 2005 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 17 Signature Series 2005 at 17,0 ft versus Sun Tracker Party Deck 21 I/O 2005 at 20,0 ft. Weight tells a clearer story for trailering families: the Sun Tracker Party Deck 21 I/O 2005 tips the scales at 2 250 lbs - 1 090 lbs less than the Sun Tracker PARTY BARGE 17 Signature Series 2005 at 1 160 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 220 hp, the Sun Tracker Party Deck 21 I/O 2005 has a 195-hp advantage over the Sun Tracker PARTY BARGE 17 Signature Series 2005's 25-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sun Tracker Party Deck 21 I/O 2005 carries 41 gallons versus 7 gallons in the Sun Tracker PARTY BARGE 17 Signature Series 2005. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Sun Tracker Party Deck 21 I/O 2005 is rated for 10 passengers, while the Sun Tracker PARTY BARGE 17 Signature Series 2005 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sun Tracker Party Deck 21 I/O 2005 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Sun Tracker Party Deck 21 I/O 2005 comes in at 10 lbs per hp versus 46 lbs per hp for the Sun Tracker PARTY BARGE 17 Signature Series 2005. The lower the ratio the more explosive the acceleration - meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
The Sun Tracker PARTY BARGE 17 Signature Series 2005 is an inflatable design - lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Sun Tracker Party Deck 21 I/O 2005 is a rigid hull, which typically offers a more confident ride in chop and easier maintenance over the long term.
Bottom line: Choose the Sun Tracker Party Deck 21 I/O 2005 if your priority is putting more people on the water - it handles 10 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Sun Tracker PARTY BARGE 17 Signature Series 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.