Matching a deep vee Duckworth 18 Sport 2011 against a modified vee Duckworth 721 2010 means you're likely deciding between two genuinely different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department — Duckworth 18 Sport 2011 at 20,3 ft versus Duckworth 721 2010 at 21,0 ft. Weight tells a clearer story for trailering families: the Duckworth 18 Sport 2011 tips the scales at 1 455 lbs — 1 439 lbs more than the Duckworth 721 2010 at 16 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 200 hp, the Duckworth 721 2010 has a 85-hp advantage over the Duckworth 18 Sport 2011's 115-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 42 gal — so range won't be a tiebreaker here.
Both boats are rated for 6 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: Performance buyers should lean toward the Duckworth 721 2010 and its 200-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Duckworth 18 Sport 2011 with its 115-hp rating is the more economical daily driver.