When two boats share the same hull type — in this case both the Meridian Yachts 391 Sedan 2009 and the Meridian Yachts 580 Pilothouse 2009 are modified 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 Meridian Yachts 580 Pilothouse 2009 measures 59,0 feet overall (2009), giving it roughly 55,0 additional feet of deck space compared to the Meridian Yachts 391 Sedan 2009 at 4,0 feet (2009). Weight tells a clearer story for trailering families: the Meridian Yachts 580 Pilothouse 2009 tips the scales at 5 992 lbs — 5 967 lbs less than the Meridian Yachts 391 Sedan 2009 at 25 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 715 hp, the Meridian Yachts 580 Pilothouse 2009 has a 707-hp advantage over the Meridian Yachts 391 Sedan 2009's 8-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Meridian Yachts 391 Sedan 2009 carries 35 gallons versus 8 gallons in the Meridian Yachts 580 Pilothouse 2009. 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 Meridian Yachts 580 Pilothouse 2009 is rated for 18 passengers, while the Meridian Yachts 391 Sedan 2009 caps at 12. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Meridian Yachts 580 Pilothouse 2009 could be the deciding factor.