Chocolate Peppermint Stick Luna Bars are my favorite and right now the only Luna Bars I eat religiously--I mean, regularly. Twice a day. Ahem.
Nutz Over Chocolate and Lemon Zest come next, but I find they sometimes leave an unpleasant aftertaste. Still, they're quite good for a snack bar. I don't really care for any of the other flavors.
(Yesterday, I found Luna Bars at Target for 97 cents each! In the Northwest, we also have a grocery store called WinCo, which sometimes lowers the price of Luna Bars to 88 cents. )