The Sea Ray 340 Sundancer 2006 vs Sea Ray Express Cruiser 390 1990 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 Express Cruiser 390 1990 measures 42,0 feet overall (1990), giving it roughly 5,0 additional feet of deck space compared to the Sea Ray 340 Sundancer 2006 at 37,0 feet (2006). Weight tells a clearer story for trailering families: the Sea Ray Express Cruiser 390 1990 tips the scales at 16 400 lbs — 16 254 lbs less than the Sea Ray 340 Sundancer 2006 at 146 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.

Both boats share a closely matched power ceiling — 375 hp for the Sea Ray 340 Sundancer 2006 and 370 hp for the Sea Ray Express Cruiser 390 1990. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Sea Ray 340 Sundancer 2006 carries 225 gallons versus 3 gallons in the Sea Ray Express Cruiser 390 1990. 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 Express Cruiser 390 1990 is rated for 12 passengers, while the Sea Ray 340 Sundancer 2006 caps at 11. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sea Ray Express Cruiser 390 1990 could be the deciding factor.