Both the Key West 1720 CC 2011 and the Key West 197 SK 2012 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?
Both boats share a closely matched power ceiling - 120 hp for the Key West 1720 CC 2011 and 115 hp for the Key West 197 SK 2012. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Key West 1720 CC 2011 carries 31 gallons versus 19 gallons in the Key West 197 SK 2012. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
The Key West 1720 CC 2011 is rated for up to 5 people. Passenger data for the Key West 197 SK 2012 wasn't available.
Bottom line: The Key West 197 SK 2012 at 19,3 ft is the right call if deck space, comfort, and entertaining are top of your list. The Key West 1720 CC 2011 at 17,2 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.