Rocky is a solid film, but I think Rocky Balboa is the best of the franchise. Ironically, it's really not even about the boxing; I like the quieter, inspirational, more thoughtful tone to the movie. His interactions with "Little Marie" and Paulie are good, and Stallone's depiction of Philadelphia and its people, showing his devotion to the city, is endearing.
Haven't seen Creed yet, so perhaps it can take the title, so to speak haha