The Achilles HB-280DX 2008 is a rigid inflatable design and the Achilles RS-140 2013 is an inflatable 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.
Size is the most obvious dividing line here. The Achilles RS-140 2013 measures 14,0 feet overall (2013), giving it roughly 5,0 additional feet of deck space compared to the Achilles HB-280DX 2008 at 9,0 feet (2008). At 148 lbs and 114 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 HB-280DX 2008 carries a rated maximum of 15 hp. Engine data for the Achilles RS-140 2013 wasn't available in our records - check the manufacturer's spec sheet before sizing a motor.
For family outings this is probably the sharpest distinction between the two. The Achilles RS-140 2013 is rated for 9 passengers, while the Achilles HB-280DX 2008 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles RS-140 2013 could be the deciding factor.
The Achilles RS-140 2013 is an inflatable design - lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Achilles HB-280DX 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 RS-140 2013 if your priority is putting more people on the water - it handles 9 passengers and at 14,0 ft it has the deck room to back that rating up comfortably. The Achilles HB-280DX 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.