When two boats share the same hull type — in this case both the Mercury 310 Air Deck PVC 2012 and the Mercury 340 Air Deck PVC 2011 are inflatable non rigid designs with plastic 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?

On paper these two are close siblings in the size department — Mercury 310 Air Deck PVC 2012 at 9,5 ft versus Mercury 340 Air Deck PVC 2011 at 11,2 ft. At 83 lbs and 99 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.

Both boats share a closely matched power ceiling — 15 hp for the Mercury 310 Air Deck PVC 2012 and 15 hp for the Mercury 340 Air Deck PVC 2011. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.

For family outings this is probably the sharpest distinction between the two. The Mercury 340 Air Deck PVC 2011 is rated for 5 passengers, while the Mercury 310 Air Deck PVC 2012 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Mercury 340 Air Deck PVC 2011 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Mercury 310 Air Deck PVC 2012 comes in at 6 lbs per hp versus 7 lbs per hp for the Mercury 340 Air Deck PVC 2011. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.