My favorite are, undoubtedly, Salt & Vinegar. They're somewhat an acquired taste, and the Lays ones are nasty (Cape Cod or Boulder Co. are the best), but once you like them, you're hooked. My second place goes to a delightful Jalapeno & Chedder chip. Really, though, I like just about anything excepting Lays in general. Too greasy, not enough crunch.