When two boats share the same hull type — in this case both the Mercury 310 Dynamic RIB PVC 2012 and the Mercury 380 Heavy Duty PVC 2012 are inflatable 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 Dynamic RIB PVC 2012 at 9,8 ft versus Mercury 380 Heavy Duty PVC 2012 at 12,0 ft. Weight tells a clearer story for trailering families: the Mercury 380 Heavy Duty PVC 2012 tips the scales at 206 lbs — 105 lbs less than the Mercury 310 Dynamic RIB PVC 2012 at 101 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.

Both boats share a closely matched power ceiling — 15 hp for the Mercury 310 Dynamic RIB PVC 2012 and 25 hp for the Mercury 380 Heavy Duty PVC 2012. 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 380 Heavy Duty PVC 2012 is rated for 6 passengers, while the Mercury 310 Dynamic RIB 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 380 Heavy Duty PVC 2012 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Mercury 310 Dynamic RIB PVC 2012 comes in at 7 lbs per hp versus 8 lbs per hp for the Mercury 380 Heavy Duty PVC 2012. 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.