Both the Key West 177 SK 2011 and the Key West 186 BR 2011 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 - Key West 177 SK 2011 at 17,3 ft versus Key West 186 BR 2011 at 18,5 ft. Weight tells a clearer story for trailering families: the Key West 186 BR 2011 tips the scales at 1 650 lbs - 550 lbs less than the Key West 177 SK 2011 at 1 100 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 150 hp, the Key West 186 BR 2011 has a 60-hp advantage over the Key West 177 SK 2011's 90-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Key West 186 BR 2011 carries 40 gallons versus 19 gallons in the Key West 177 SK 2011. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Bottom line: Performance buyers should lean toward the Key West 186 BR 2011 and its 150-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Key West 177 SK 2011 with its 90-hp rating is the more economical daily driver.