I'd say my favourite cookie would be cranberry ones. You know, with instead of the chocolate chips delicious yummy tasty dried cranberries. Yeah, I have weird tastes.
Oh geez, I like all kinds of cookies, it's had to say what my fave is.... I'll just put all the cookies I like:
-Chocolate Chip
-White Chocolate Macadamia Nut
-Carnival (the kinds that have M&M's in them)
-Double Chocolate Chip ( you can NEVER have enough chocolate)
-Sugar
-Oatmeal Rasin
-Gingersnaps
-Snickerdoodles
Boring answer but I have to say Chocolate Chip. Preferably with little peanut butter chunks, and a harder cookie. I prefer some crunch over the softer/gooey variety. Now I'm hungry for cookies!