When two boats share the same hull type — in this case both the Duckworth 19 2011 and the Duckworth Ultra Magnum Inboard 23 ft. 2008 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 Ultra Magnum Inboard 23 ft. 2008 measures 23,0 feet overall (2008), giving it roughly 4,0 additional feet of deck space compared to the Duckworth 19 2011 at 19,0 feet (2011). Weight tells a clearer story for trailering families: the Duckworth Ultra Magnum Inboard 23 ft. 2008 tips the scales at 361 lbs — 336 lbs less than the Duckworth 19 2011 at 25 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 Ultra Magnum Inboard 23 ft. 2008 is rated for 7 passengers, while the Duckworth 19 2011 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Duckworth Ultra Magnum Inboard 23 ft. 2008 could be the deciding factor.
Bottom line: Choose the Duckworth Ultra Magnum Inboard 23 ft. 2008 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 19 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.