Raven vs. Starfire refers to the community of shipper fans of the television show "Teen Titans" and their opinions on which character Robin should be in a relationship with. "Shippers" are fans who focus on a fictional relationship, one that may or may not actually exist in the work.
In the comic book continuity, Robin and Starfire have traditionally been depicted as being in a relationship. The television show has generally followed this convention, although it tends to focus less on the interpersonal relationships of the characters and more on action. Raven shippers argue that her character would make a better match for Robin and even go to the lengths of creating fan art and fan fiction based on this concept.