When two boats share the same hull type — in this case both the Mercury DR490 2008 and the Mercury PT520 2008 are inflatable 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?

On paper these two are close siblings in the size department — Mercury DR490 2008 at 16,0 ft versus Mercury PT520 2008 at 17,0 ft. Weight tells a clearer story for trailering families: the Mercury PT520 2008 tips the scales at 661 lbs — 192 lbs less than the Mercury DR490 2008 at 469 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 — 80 hp for the Mercury DR490 2008 and 100 hp for the Mercury PT520 2008. 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 PT520 2008 is rated for 9 passengers, while the Mercury DR490 2008 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Mercury PT520 2008 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Mercury DR490 2008 comes in at 6 lbs per hp versus 7 lbs per hp for the Mercury PT520 2008. 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.