When two boats share the same hull type — in this case both the Zodiac Pro 420 2011 and the Zodiac Yachtline Rib 340R 2008 are inflatable rigid designs with fiberglass 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 — Zodiac Pro 420 2011 at 13,8 ft versus Zodiac Yachtline Rib 340R 2008 at 11,0 ft. Weight tells a clearer story for trailering families: the Zodiac Pro 420 2011 tips the scales at 399 lbs — 232 lbs more than the Zodiac Yachtline Rib 340R 2008 at 167 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.
The power gap is worth calling out. Rated to 50 hp, the Zodiac Pro 420 2011 has a 25-hp advantage over the Zodiac Yachtline Rib 340R 2008's 25-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Zodiac Pro 420 2011 is rated for 7 passengers, while the Zodiac Yachtline Rib 340R 2008 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Zodiac Pro 420 2011 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Zodiac Yachtline Rib 340R 2008 comes in at 7 lbs per hp versus 8 lbs per hp for the Zodiac Pro 420 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.
Top speed is rated at 37 mph for the Zodiac Pro 420 2011 and 34 mph for the Zodiac Yachtline Rib 340R 2008.
Bottom line: Choose the Zodiac Pro 420 2011 if your priority is putting more people on the water — it handles 7 passengers and at 13,8 ft it has the deck room to back that rating up comfortably. The Zodiac Yachtline Rib 340R 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.