The Zodiac 550 2009 vs Zodiac Zoom 340 S 2006 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.
The power gap is worth calling out. Rated to 120 hp, the Zodiac 550 2009 has a 110-hp advantage over the Zodiac Zoom 340 S 2006'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 550 2009 is rated for 11 passengers, while the Zodiac Zoom 340 S 2006 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Zodiac 550 2009 could be the deciding factor.
Bottom line: Choose the Zodiac 550 2009 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 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.