Cookies to me are only good chewy when they are right out of the oven, but those store bought chewy cookies don't really sit right with me, so if I get store bought cookies I would rather just pick crunchy.
Definitely depends on the cookie. Some cookies need both! When I make snicker doodles, its all about the perfect balance of a little crunchy on the edges, but soft and chewy in the middle!
Also when I want a chocolate chip cookie with ice cream on top, they're best if they're not quite done in the middle and fresh out of the oven!
I think overall, I like just a little bit of chew. But lacey cookies are best when they have some crunch for example!