Out of all the flavors I've tried I think like applewood
tobacco the best. Ones with subtle natural tasting apple to it though, not some in your face sweetness that overpowers the
tobacco in it.
Definitely prefer tobacco flavors that don't have much sweetness to them as an in general, but maybe a mild one, or at least not something too harsh.
Green tea is also a flavor I find very enjoyable, as well as a good menthol.
I can dig the RY4 and 555 type stuff, even some fruits and stuff like blueberry cheesecake, but eventually, or maybe more so quickly, all the sweetness wears out it's welcome.
Cappuccino is a flavor I really like a lot as well if again it only had a little sweetness to it.