The Nitro 640 2008 vs Nitro Nitro Z7 Sport 2013 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 150 hp, the Nitro Nitro Z7 Sport 2013 has a 60-hp advantage over the Nitro 640 2008's 90-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 Nitro Nitro Z7 Sport 2013 is rated for 5 passengers, while the Nitro 640 2008 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Nitro Nitro Z7 Sport 2013 could be the deciding factor.