The Sea Ray Express Cruiser 390 1990 vs Sea Ray Sundeck 270 2015 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 15,9 additional feet of deck space compared to the Sea Ray Sundeck 270 2015 at 26,1 feet (2015). Weight tells a clearer story for trailering families: the Sea Ray Express Cruiser 390 1990 tips the scales at 16 400 lbs - 10 475 lbs more than the Sea Ray Sundeck 270 2015 at 5 925 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 370 hp, the Sea Ray Express Cruiser 390 1990 has a 70-hp advantage over the Sea Ray Sundeck 270 2015's 300-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 Express Cruiser 390 1990 carries 300 gallons versus 65 gallons in the Sea Ray Sundeck 270 2015. 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 Sundeck 270 2015 caps at 7. 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.
Bottom line: Choose the Sea Ray Express Cruiser 390 1990 if your priority is putting more people on the water - it handles 12 passengers and at 42,0 ft it has the deck room to back that rating up comfortably. The Sea Ray Sundeck 270 2015 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.