When two boats share the same hull type — in this case both the Tiara Yachts 3900 Open 2010 and the Tiara Yachts 5800 Sovran 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 Tiara Yachts 5800 Sovran 2009 measures 57,0 feet overall (2009), giving it roughly 15,1 additional feet of deck space compared to the Tiara Yachts 3900 Open 2010 at 41,9 feet (2010). Weight tells a clearer story for trailering families: the Tiara Yachts 5800 Sovran 2009 tips the scales at 435 lbs — 190 lbs less than the Tiara Yachts 3900 Open 2010 at 245 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 Tiara Yachts 5800 Sovran 2009 tops out at 435 hp. Engine specs for the Tiara Yachts 3900 Open 2010 aren't listed — confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Tiara Yachts 3900 Open 2010 carries 535 gallons versus 65 gallons in the Tiara Yachts 5800 Sovran 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 Tiara Yachts 5800 Sovran 2009 is rated for 17 passengers, while the Tiara Yachts 3900 Open 2010 caps at 12. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Tiara Yachts 5800 Sovran 2009 could be the deciding factor.