The Lund 1800 Alaskan Tiller 2011 is a modified-V design and the Lund SSV 18 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 1800 Alaskan Tiller 2011 at 18,8 ft versus Lund SSV 18 2013 at 18,0 ft. Weight tells a clearer story for trailering families: the Lund 1800 Alaskan Tiller 2011 tips the scales at 975 lbs - 515 lbs more than the Lund SSV 18 2013 at 460 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 - 75 hp for the Lund 1800 Alaskan Tiller 2011 and 60 hp for the Lund SSV 18 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 18 2013 is rated for 7 passengers, while the Lund 1800 Alaskan Tiller 2011 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Lund SSV 18 2013 could be the deciding factor.
Bottom line: Choose the Lund SSV 18 2013 if your priority is putting more people on the water - it handles 7 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Lund 1800 Alaskan Tiller 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.