Dave Meltzer leans to the latter:
The summer season will peak with UFC 100 on July 11 in Las Vegas will answer the question as to what exactly is the ceiling for mixed martial arts on pay-per-view. The main event between Brock Lesnar vs. Frank Mir itself has all the elements necessary to being the biggest drawing heavyweight match in North America. The UFC heavyweight and interim heavyweight titles will be unified in a rematch of one of the most memorable fights and talked about fights in company history.
But for all the hype Lesnar vs. Mir will receive, one could make a strong case that from a pure sports ranking standpoint, the biggest heavyweight fight ever on U.S. soil will take place three weeks later at the Honda Center in Anaheim, Calif., on Affliction’s third pay-per-view show.
Consensus No. 1 ranked Fedor Emelianenko puts up his reputation as the most successful fighter in the history of the sport, against Josh Barnett. LINK