I love both, today I had some Starbucks after I recently found $50 worth of gift cards
The thing I love about Dunkin is how fast, easy, and cheap it is and you still get great coffee. I usually go to Starbucks as more of a treat and I love the frappucinos and passion iced tea, but the long wait at Starbucks usually makes me itch, as a Jersey boy im always in a rush and I need to get what I want and GO.