Guinness at 6:30 or Migden/Leno Brawl at 7?

A few weeks ago, I got an email from Merchant’s Exchange Building and signed up. Who can pass up discounted Guinness, right?
Then I realized that it’s the same night of the more recently announced debate/knife fight between Sen. Carole Migden and Assemblyman Mark Leno, which I figured might be worth some blogging goodness.
Guinness at 6:30 or Brawl at 7? Which should I choose?