The Sea Ray 310 Sundancer 2007 vs Sea Ray 580 Sedan Bridge 2012 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 Sea Ray 580 Sedan Bridge 2012 measures 58,6 feet overall (2012), giving it roughly 25,6 additional feet of deck space compared to the Sea Ray 310 Sundancer 2007 at 33,0 feet (2007). Weight tells a clearer story for trailering families: the Sea Ray 580 Sedan Bridge 2012 tips the scales at 515 lbs — 501 lbs less than the Sea Ray 310 Sundancer 2007 at 14 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 861 hp, the Sea Ray 580 Sedan Bridge 2012 has a 541-hp advantage over the Sea Ray 310 Sundancer 2007's 320-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sea Ray 580 Sedan Bridge 2012 carries 7 gallons versus 2 gallons in the Sea Ray 310 Sundancer 2007. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Sea Ray 580 Sedan Bridge 2012 is rated for 17 passengers, while the Sea Ray 310 Sundancer 2007 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sea Ray 580 Sedan Bridge 2012 could be the deciding factor.