i prefer DD coffee, but i think it's more of a mental thing. when i started drinking coffee, there was none in the wny area. i went to school in boston, and those suckers were literally everywhere. even our campus had combined DD/baskin robins(maybe friendlys) stores every few buildings. we drank them all the time.
that being said, the DD food is total horse ****. tim's food is far superior, but the coffee is very meh to me. part of it is i hate the cup lids. it gets everywhere. the engineering for the DD lids is straight up magical.