Halo 3: ODST or Halo 2 style campaign

With Agent Locke being playable and almost certainly going to be playing as Chief also, would a Halo 2 style campaign where we swap characters at regular intervals and playing the 2 different aspects of the story alongside each other work best; or a Halo 3:ODST style where we’re playing as Locke as we track the Chief and at each major spot we play as Chief to see what took place?

What would you guys prefer?