Depends on your taste, if you like a damn good technical wrestling match, then SSeries 96 it is. A nice bloody brawl, WM 13.
I liked SSeries better though because not only of the workrate, but also because of the story. The new guy Austin who thought he was all that trying to make a name for himself trying to defeat the veteran Hart. Austin was on a roll (His KOTR win jumpstarted this), it was Bret's return match (last time he wrestled before this match was WM 12), and it all happened at MSG. He didn't win, but Bret and Steve had great chemistry. Of course, WM 13 is what immortalized Stone Cold, but SSeries, in my mind, is what really paved the way to his future success.