Both the Sundance F17CCR 2008 and the Sundance SV186 2010 are modified-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 - Sundance F17CCR 2008 at 16,0 ft versus Sundance SV186 2010 at 18,5 ft. At 1 420 lbs and 1 425 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 115 hp, the Sundance SV186 2010 has a 45-hp advantage over the Sundance F17CCR 2008's 70-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sundance SV186 2010 carries 40 gallons versus 24 gallons in the Sundance F17CCR 2008. 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.
Bottom line: The Sundance SV186 2010 at 18,5 ft is the right call if deck space, comfort, and entertaining are top of your list. The Sundance F17CCR 2008 at 16,0 ft wins on trailering ease, likely lower purchase price, and simpler docking - a solid choice for a buyer who wants more boat for less money.