The Sea Ray 310 Sundancer 2011 vs Sea Ray 390 Motor Yacht 2005 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 390 Motor Yacht 2005 measures 41,0 feet overall (2005), giving it roughly 10,0 additional feet of deck space compared to the Sea Ray 310 Sundancer 2011 at 31,0 feet (2011). Weight tells a clearer story for trailering families: the Sea Ray 310 Sundancer 2011 tips the scales at 1 163 lbs — 898 lbs more than the Sea Ray 390 Motor Yacht 2005 at 265 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 Sea Ray 310 Sundancer 2011 carries a rated maximum of 300 hp. Engine data for the Sea Ray 390 Motor Yacht 2005 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.Fuel capacity breaks the other way: the Sea Ray 310 Sundancer 2011 carries 125 gallons versus 3 gallons in the Sea Ray 390 Motor Yacht 2005. 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 390 Motor Yacht 2005 is rated for 12 passengers, while the Sea Ray 310 Sundancer 2011 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sea Ray 390 Motor Yacht 2005 could be the deciding factor.