When two boats share the same hull type — in this case both the Riviera Yachts 45 Open Flybridge 2011 and the Riviera Yachts 47 Open Flybridge SII 2012 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 47 Open Flybridge SII 2012 measures 53,1 feet overall (2012), giving it roughly 4,8 additional feet of deck space compared to the Riviera Yachts 45 Open Flybridge 2011 at 48,3 feet (2011). At 394 lbs and 432 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.

The power gap is worth calling out. Rated to 715 hp, the Riviera Yachts 47 Open Flybridge SII 2012 has a 45-hp advantage over the Riviera Yachts 45 Open Flybridge 2011'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 47 Open Flybridge SII 2012 carries 977 gallons versus 608 gallons in the Riviera Yachts 45 Open Flybridge 2011. 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 47 Open Flybridge SII 2012 is rated for 15 passengers, while the Riviera Yachts 45 Open Flybridge 2011 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 47 Open Flybridge SII 2012 could be the deciding factor.