The Zodiac Pro Open 550 2011 vs Zodiac Zoom 340 S 2007 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Zodiac Pro Open 550 2011 measures 18,1 feet overall (2011), giving it roughly 7,1 additional feet of deck space compared to the Zodiac Zoom 340 S 2007 at 11,0 feet (2007). Weight tells a clearer story for trailering families: the Zodiac Pro Open 550 2011 tips the scales at 882 lbs — 774 lbs more than the Zodiac Zoom 340 S 2007 at 108 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 120 hp, the Zodiac Pro Open 550 2011 has a 110-hp advantage over the Zodiac Zoom 340 S 2007's 10-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 Open 550 2011 is rated for 11 passengers, while the Zodiac Zoom 340 S 2007 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 Open 550 2011 could be the deciding factor.
Bottom line: Choose the Zodiac Pro Open 550 2011 if your priority is putting more people on the water — it handles 11 passengers and at 18,1 ft it has the deck room to back that rating up comfortably. The Zodiac Zoom 340 S 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.