The Sea Ray 21 Jet 2013 vs Sea Ray Sundancer 340 1986 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 Sundancer 340 1986 measures 36,0 feet overall (1986), giving it roughly 14,5 additional feet of deck space compared to the Sea Ray 21 Jet 2013 at 21,5 feet (2013). Weight tells a clearer story for trailering families: the Sea Ray Sundancer 340 1986 tips the scales at 14 600 lbs — 11 717 lbs less than the Sea Ray 21 Jet 2013 at 2 883 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 320 hp, the Sea Ray Sundancer 340 1986 has a 200-hp advantage over the Sea Ray 21 Jet 2013's 120-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 Sundancer 340 1986 carries 225 gallons versus 45 gallons in the Sea Ray 21 Jet 2013. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 10 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.