When two boats share the same hull type — in this case both the Key West 166 SK 2010 and the Key West 198 SK 2013 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?
On paper these two are close siblings in the size department — Key West 166 SK 2010 at 16,0 ft versus Key West 198 SK 2013 at 19,0 ft. Weight tells a clearer story for trailering families: the Key West 198 SK 2013 tips the scales at 135 lbs — 127 lbs less than the Key West 166 SK 2010 at 8 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 140 hp, the Key West 198 SK 2013 has a 90-hp advantage over the Key West 166 SK 2010's 50-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
The Key West 166 SK 2010 is rated for up to 4 people. Passenger data for the Key West 198 SK 2013 wasn't available.
Bottom line: The Key West 198 SK 2013 at 19,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Key West 166 SK 2010 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.