I thought the Showtime card was better, but I'm glad I got to watch 6 fights in one night, and one show didn't conflict with the other. I thought the Showtime crew, did a better job than HBO in calling the action last night.
I think the highlight of the night was Khan's performance. Bradley fight was fun but sloppy. Also, Mares was more exciting than either Herrera/Benavidez and Lee/Korobov (even though that one had the most dramatic event).
I think GBP gets the nod that night.
Mares fight was entertaining. Khan-Alexander was a good display from Khan.
Herrera-Benavidez was fun, but ended in robbery. Korobov-Lee ended excitingly.
Conclusion: Each of the two cards had their moments, 50/50.