When two boats share the same hull type — in this case both the Zodiac Medline II 2011 and the Zodiac Pro Classic 420 2013 are deep vee 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 II 2011 measures 19,7 feet overall (2011), giving it roughly 5,9 additional feet of deck space compared to the Zodiac Pro Classic 420 2013 at 13,8 feet (2013). Weight tells a clearer story for trailering families: the Zodiac Medline II 2011 tips the scales at 1 521 lbs — 1 122 lbs more than the Zodiac Pro Classic 420 2013 at 399 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 150 hp, the Zodiac Medline II 2011 has a 100-hp advantage over the Zodiac Pro Classic 420 2013's 50-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 Classic 420 2013 is rated for 7 passengers, while the Zodiac Medline II 2011 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 Classic 420 2013 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Zodiac Pro Classic 420 2013 comes in at 8 lbs per hp versus 10 lbs per hp for the Zodiac Medline II 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 46 mph for the Zodiac Medline II 2011 and 37 mph for the Zodiac Pro Classic 420 2013.
The Zodiac Pro Classic 420 2013 is an inflatable design — lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Zodiac Medline II 2011 is a rigid hull, which typically offers a more confident ride in chop and easier maintenance over the long term.
Bottom line: Choose the Zodiac Pro Classic 420 2013 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 Medline II 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.