When two boats share the same hull type — in this case both the Duckworth 21 2010 and the Duckworth Offshore 28 2012 are deep vee 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?
Size is the most obvious dividing line here. The Duckworth 21 2010 measures 21,0 feet overall (2010), giving it roughly 18,0 additional feet of deck space compared to the Duckworth Offshore 28 2012 at 3,0 feet (2012). At 28 lbs and 51 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The Duckworth Offshore 28 2012 tops out at 5 hp. Engine specs for the Duckworth 21 2010 aren't listed — confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Duckworth Offshore 28 2012 carries 175 gallons versus 62 gallons in the Duckworth 21 2010. 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 Duckworth Offshore 28 2012 is rated for 9 passengers, while the Duckworth 21 2010 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Duckworth Offshore 28 2012 could be the deciding factor.
Bottom line: Choose the Duckworth Offshore 28 2012 if your priority is putting more people on the water — it handles 9 passengers and at 3,0 ft it has the deck room to back that rating up comfortably. The Duckworth 21 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.