When two boats share the same hull type — in this case both the Sea Ray 520 Sedan Bridge 2010 and the Sea Ray 540 Sundancer 2009 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?

On paper these two are close siblings in the size department — Sea Ray 520 Sedan Bridge 2010 at 57,1 ft versus Sea Ray 540 Sundancer 2009 at 54,8 ft. Weight tells a clearer story for trailering families: the Sea Ray 520 Sedan Bridge 2010 tips the scales at 40 267 lbs — 40 262 lbs more than the Sea Ray 540 Sundancer 2009 at 5 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 765 hp, the Sea Ray 520 Sedan Bridge 2010 has a 191-hp advantage over the Sea Ray 540 Sundancer 2009's 574-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 5 gal and 6 gal — so range won't be a tiebreaker here.

The Sea Ray 520 Sedan Bridge 2010 is rated for up to 17 people. Passenger data for the Sea Ray 540 Sundancer 2009 wasn't available.