The Riviera 505 SUV 2020 vs Riviera Yachts 51 Enclosed Flybridge SII 2009 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.

On paper these two are close siblings in the size department — Riviera 505 SUV 2020 at 55,1 ft versus Riviera Yachts 51 Enclosed Flybridge SII 2009 at 54,0 ft. Weight tells a clearer story for trailering families: the Riviera 505 SUV 2020 tips the scales at 54 013 lbs — 49 207 lbs more than the Riviera Yachts 51 Enclosed Flybridge SII 2009 at 4 806 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 825 hp, the Riviera Yachts 51 Enclosed Flybridge SII 2009 has a 100-hp advantage over the Riviera 505 SUV 2020's 725-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Riviera Yachts 51 Enclosed Flybridge SII 2009 carries 977 gallons versus 872 gallons in the Riviera 505 SUV 2020. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 16 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.