Matching a deep vee Duckworth 23 2011 against a modified vee Duckworth 721 2011 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 23 2011 at 23,0 ft versus Duckworth 721 2011 at 21,0 ft. Weight tells a clearer story for trailering families: the Duckworth 23 2011 tips the scales at 361 lbs — 345 lbs more than the Duckworth 721 2011 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.
For family outings this is probably the sharpest distinction between the two. The Duckworth 23 2011 is rated for 7 passengers, while the Duckworth 721 2011 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Duckworth 23 2011 could be the deciding factor.
Bottom line: Choose the Duckworth 23 2011 if your priority is putting more people on the water — it handles 7 passengers and at 23,0 ft it has the deck room to back that rating up comfortably. The Duckworth 721 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.