When two boats share the same hull type — in this case both the Zodiac Cadet RIB 340 2011 and the Zodiac Medline Sundream Zenith 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?
Size is the most obvious dividing line here. The Zodiac Medline Sundream Zenith 2008 measures 16,0 feet overall (2008), giving it roughly 4,8 additional feet of deck space compared to the Zodiac Cadet RIB 340 2011 at 11,2 feet (2011). Weight tells a clearer story for trailering families: the Zodiac Medline Sundream Zenith 2008 tips the scales at 875 lbs — 703 lbs less than the Zodiac Cadet RIB 340 2011 at 172 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 80 hp, the Zodiac Medline Sundream Zenith 2008 has a 55-hp advantage over the Zodiac Cadet RIB 340 2011'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 Cadet RIB 340 2011 is rated for 5 passengers, while the Zodiac Medline Sundream Zenith 2008 caps at 1. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Zodiac Cadet RIB 340 2011 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Zodiac Cadet RIB 340 2011 comes in at 7 lbs per hp versus 11 lbs per hp for the Zodiac Medline Sundream Zenith 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.
Top speed is rated at 42 mph for the Zodiac Medline Sundream Zenith 2008 and 30 mph for the Zodiac Cadet RIB 340 2011.
Bottom line: Choose the Zodiac Cadet RIB 340 2011 if your priority is putting more people on the water — it handles 5 passengers and at 11,2 ft it has the deck room to back that rating up comfortably. The Zodiac Medline Sundream Zenith 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 1 that costs less to run day-to-day.