The Lund 1648M 2009 is a modified-V design and the Lund SSV 16 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.
On paper these two are close siblings in the size department - Lund 1648M 2009 at 15,0 ft versus Lund SSV 16 2013 at 16,0 ft. At 420 lbs and 350 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.
Both boats share a closely matched power ceiling - 35 hp for the Lund 1648M 2009 and 40 hp for the Lund SSV 16 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 Lund SSV 16 2013 is rated for 6 passengers, while the Lund 1648M 2009 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Lund SSV 16 2013 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Lund SSV 16 2013 comes in at 9 lbs per hp versus 12 lbs per hp for the Lund 1648M 2009. 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 Lund SSV 16 2013 if your priority is putting more people on the water - it handles 6 passengers and at 16,0 ft it has the deck room to back that rating up comfortably. The Lund 1648M 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.