When two boats share the same hull type — in this case both the Riviera Yachts 45 Open Flybridge Shaft Drive 2012 and the Riviera Yachts 63 Enclosed Flybridge 2013 are deep vee 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?

Size is the most obvious dividing line here. The Riviera Yachts 63 Enclosed Flybridge 2013 measures 67,3 feet overall (2013), giving it roughly 16,0 additional feet of deck space compared to the Riviera Yachts 45 Open Flybridge Shaft Drive 2012 at 51,3 feet (2012). Weight tells a clearer story for trailering families: the Riviera Yachts 63 Enclosed Flybridge 2013 tips the scales at 684 lbs — 290 lbs less than the Riviera Yachts 45 Open Flybridge Shaft Drive 2012 at 394 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 1 150 hp, the Riviera Yachts 63 Enclosed Flybridge 2013 has a 480-hp advantage over the Riviera Yachts 45 Open Flybridge Shaft Drive 2012's 670-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 63 Enclosed Flybridge 2013 carries 1 492 gallons versus 608 gallons in the Riviera Yachts 45 Open Flybridge Shaft Drive 2012. 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 Riviera Yachts 63 Enclosed Flybridge 2013 is rated for 20 passengers, while the Riviera Yachts 45 Open Flybridge Shaft Drive 2012 caps at 14. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Riviera Yachts 63 Enclosed Flybridge 2013 could be the deciding factor.