I have to go with Bryan vs. The Authority. I think Punk vs. Heyman had potential, but WWE dragged it out too long and, in hindsight, neither Ryback or Axel were guys who should've been paired with him. Bryan vs. The Authority might not have had the ending, or temporary ending at least, most people may have wanted, but it was an interesting feud that kept people endlessly talking and asking questions about. For instance, questions like "could it be Bryan vs. Triple H at WM for the title?", "Cena vs. Bryan II at WM XXX?", etc.