Both the Donzi 16 Classic 2013 and the Donzi 18 Classic 2009 are deep-V designs, both built in fibreglass, so 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 - Donzi 16 Classic 2013 at 16,4 ft versus Donzi 18 Classic 2009 at 18,0 ft. Weight tells a clearer story for trailering families: the Donzi 18 Classic 2009 tips the scales at 2 700 lbs - 200 lbs less than the Donzi 16 Classic 2013 at 2 500 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 350 hp, the Donzi 18 Classic 2009 has a 90-hp advantage over the Donzi 16 Classic 2013's 260-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Donzi 18 Classic 2009 carries 41 gallons versus 32 gallons in the Donzi 16 Classic 2013. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 5 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.

At this size, power-to-weight ratio matters more than outright horsepower. The Donzi 18 Classic 2009 comes in at 8 lbs per hp versus 10 lbs per hp for the Donzi 16 Classic 2013. The lower the ratio the more explosive the acceleration - meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.