The Duckworth 28 2010 is a modified-V design and the Duckworth Offshore 30 2013 is a deep-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
Size is the most obvious dividing line here. The Duckworth Offshore 30 2013 measures 32,0 feet overall (2013), giving it roughly 4,0 additional feet of deck space compared to the Duckworth 28 2010 at 28,0 feet (2010). Weight tells a clearer story for trailering families: the Duckworth Offshore 30 2013 tips the scales at 5 400 lbs - 300 lbs less than the Duckworth 28 2010 at 5 100 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.
Both boats share a closely matched power ceiling - 500 hp for the Duckworth 28 2010 and 500 hp for the Duckworth Offshore 30 2013. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads - 130 gal and 130 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Duckworth Offshore 30 2013 is rated for 9 passengers, while the Duckworth 28 2010 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Duckworth Offshore 30 2013 could be the deciding factor.
Bottom line: Choose the Duckworth Offshore 30 2013 if your priority is putting more people on the water - it handles 9 passengers and at 32,0 ft it has the deck room to back that rating up comfortably. The Duckworth 28 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.