The Xpress 1650D 2011 is a flat-bottom design and the Xpress HD15DB 2013 is a modified-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.
On paper these two are close siblings in the size department - Xpress 1650D 2011 at 16,0 ft versus Xpress HD15DB 2013 at 15,0 ft. Weight tells a clearer story for trailering families: the Xpress HD15DB 2013 tips the scales at 545 lbs - 135 lbs less than the Xpress 1650D 2011 at 410 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 - 40 hp for the Xpress 1650D 2011 and 40 hp for the Xpress HD15DB 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.
For family outings this is probably the sharpest distinction between the two. The Xpress 1650D 2011 is rated for 4 passengers, while the Xpress HD15DB 2013 caps at 3. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Xpress 1650D 2011 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Xpress 1650D 2011 comes in at 10 lbs per hp versus 14 lbs per hp for the Xpress HD15DB 2013. The lower the ratio the more explosive the acceleration - meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
Bottom line: Choose the Xpress 1650D 2011 if your priority is putting more people on the water - it handles 4 passengers and at 16,0 ft it has the deck room to back that rating up comfortably. The Xpress HD15DB 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 3 that costs less to run day-to-day.