When two boats share the same hull type — in this case both the Sea Ray 580 Sedan Bridge 2010 and the Sea Ray 580 Sundancer 2010 are semi displacement designs with fiberglass construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?

Size is the most obvious dividing line here. The Sea Ray 580 Sedan Bridge 2010 measures 58,6 feet overall (2010), giving it roughly 52,6 additional feet of deck space compared to the Sea Ray 580 Sundancer 2010 at 6,0 feet (2010). At 515 lbs and 535 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.

The power gap is worth calling out. Rated to 1 051 hp, the Sea Ray 580 Sundancer 2010 has a 190-hp advantage over the Sea Ray 580 Sedan Bridge 2010's 861-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 Sundancer 2010 carries 825 gallons versus 7 gallons in the Sea Ray 580 Sedan Bridge 2010. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

The Sea Ray 580 Sedan Bridge 2010 is rated for up to 17 people. Passenger data for the Sea Ray 580 Sundancer 2010 wasn't available.