When two boats share the same hull type — in this case both the Tiara Yachts 3900 Convertible 2010 and the Tiara Yachts 3900 Open 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?

On paper these two are close siblings in the size department — Tiara Yachts 3900 Convertible 2010 at 41,6 ft versus Tiara Yachts 3900 Open 2013 at 41,9 ft. Weight tells a clearer story for trailering families: the Tiara Yachts 3900 Convertible 2010 tips the scales at 30 125 lbs — 29 880 lbs more than the Tiara Yachts 3900 Open 2013 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 3900 Open 2013 tops out at 550 hp. Engine specs for the Tiara Yachts 3900 Convertible 2010 aren't listed — confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Tiara Yachts 3900 Open 2013 carries 535 gallons versus 475 gallons in the Tiara Yachts 3900 Convertible 2010. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 12 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.