The Achilles HB-310 2008 is a rigid inflatable design and the Achilles KSB-116 2010 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.
On paper these two are close siblings in the size department - Achilles HB-310 2008 at 10,0 ft versus Achilles KSB-116 2010 at 11,5 ft. At 126 lbs and 46 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-310 2008 carries a rated maximum of 15 hp. Engine data for the Achilles KSB-116 2010 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 HB-310 2008 is rated for 4 passengers, while the Achilles KSB-116 2010 caps at 2. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles HB-310 2008 could be the deciding factor.
Bottom line: Choose the Achilles HB-310 2008 if your priority is putting more people on the water - it handles 4 passengers and at 10,0 ft it has the deck room to back that rating up comfortably. The Achilles KSB-116 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 2 that costs less to run day-to-day.