Matching a inflatable non rigid Achilles RS-116 2012 against a inflatable rigid Achilles SU-18 2008 means you're likely deciding between two genuinely different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
Size is the most obvious dividing line here. The Achilles SU-18 2008 measures 18,0 feet overall (2008), giving it roughly 6,5 additional feet of deck space compared to the Achilles RS-116 2012 at 11,5 feet (2012). At 75 lbs and 44 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.
The Achilles SU-18 2008 tops out at 90 hp. Engine specs for the Achilles RS-116 2012 aren't listed — confirm with a dealer before selecting an outboard.
For family outings this is probably the sharpest distinction between the two. The Achilles SU-18 2008 is rated for 11 passengers, while the Achilles RS-116 2012 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles SU-18 2008 could be the deciding factor.
The Achilles RS-116 2012 is an inflatable design — lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Achilles SU-18 2008 is a rigid hull, which typically offers a more confident ride in chop and easier maintenance over the long term.
Bottom line: Choose the Achilles SU-18 2008 if your priority is putting more people on the water — it handles 11 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Achilles RS-116 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.