I generally don't like wings in general, flat or not, because people put all kinds of sauce on it and it makes it so messy. I'm not normally OCD about not wanting to get my hands dirty or anything, but wings make me feel that way.
I don't really eat wings unless someone offers them to me, but I'd have to say drumsticks. They have more meat and are easier to eat. I feel like I never get anything out of the flat kind.
Honestly flats, I'm too picky with all the veins and fat and the like, and it means the flats actually have more meat for me. I want PURELY meat, and the flats only have one icky vein I need to navigate around ><