Snickerdoodles are my favorite, closely followed by Peanut Butter and Chocolate Chip.
I think the only cookie I've had that I didnt like was a Rumpledoodle. It's the cookie that Heffalumps love in Disney's Heffalump movie, and the recipe was on Disney's website. I made them, and they were strange. Kind of a cross between and Oatmeal Raisin, Molasses, and Snickerdoodle, which wasn't as appealing as i thought it would be.