The Crestliner Backwater 1652 SC 2011 is a modified-V design and the Crestliner Kodiak 18 Tiller 2012 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 - Crestliner Backwater 1652 SC 2011 at 16,0 ft versus Crestliner Kodiak 18 Tiller 2012 at 18,0 ft. Weight tells a clearer story for trailering families: the Crestliner Kodiak 18 Tiller 2012 tips the scales at 810 lbs - 106 lbs less than the Crestliner Backwater 1652 SC 2011 at 704 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 - 50 hp for the Crestliner Backwater 1652 SC 2011 and 70 hp for the Crestliner Kodiak 18 Tiller 2012. 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 Crestliner Kodiak 18 Tiller 2012 is rated for 6 passengers, while the Crestliner Backwater 1652 SC 2011 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Crestliner Kodiak 18 Tiller 2012 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Crestliner Kodiak 18 Tiller 2012 comes in at 12 lbs per hp versus 14 lbs per hp for the Crestliner Backwater 1652 SC 2011. 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 Crestliner Kodiak 18 Tiller 2012 if your priority is putting more people on the water - it handles 6 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Crestliner Backwater 1652 SC 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.