When two boats share the same hull type — in this case both the Achilles RS-116 2013 and the Achilles SU-18 Commercial 2013 are inflatable non rigid designs with inflatable construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?

Size is the most obvious dividing line here. The Achilles SU-18 Commercial 2013 measures 18,0 feet overall (2013), giving it roughly 6,5 additional feet of deck space compared to the Achilles RS-116 2013 at 11,5 feet (2013). Weight tells a clearer story for trailering families: the Achilles SU-18 Commercial 2013 tips the scales at 433 lbs — 358 lbs less than the Achilles RS-116 2013 at 75 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.

The Achilles SU-18 Commercial 2013 tops out at 90 hp. Engine specs for the Achilles RS-116 2013 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 Commercial 2013 is rated for 11 passengers, while the Achilles RS-116 2013 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 Commercial 2013 could be the deciding factor.

Both are inflatable designs, which means they pack down for compact storage, can be carried in a bag, and are dramatically lighter than equivalent rigid hulls. The trade-off is setup time and the need to monitor tube pressure regularly. Tube diameter differs: 17 in. (43 cm) on the Achilles RS-116 2013 vs 24 in. (60 cm) on the Achilles SU-18 Commercial 2013 — larger tubes generally mean more buoyancy and a drier, more stable ride.