When two boats share the same hull type — in this case both the Achilles RS-110 2009 and the Achilles SPD-310 2008 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 RS-110 2009 measures 11,0 feet overall (2009), giving it roughly 10,0 additional feet of deck space compared to the Achilles SPD-310 2008 at 1,0 feet (2008). At 72 lbs and 101 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 SPD-310 2008 tops out at 10 hp. Engine specs for the Achilles RS-110 2009 aren't listed — confirm with a dealer before selecting an outboard.
Both boats are rated for 4 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: The Achilles RS-110 2009 at 11,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Achilles SPD-310 2008 at 1,0 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.