Re: What rematch would you rather see: Cena/Rock or Brock/HHH?
If I had to pick, it would easily be Triple H against Brock. It would make more sense storywise. They almost hinted at a rematch and as some have mentioned on this thread, they are absolutely capable of redeeming themselves since their Summerslam match wasn't impressive at all. I seriously think that if they were to add a stipulation like a Last Man Standing or something, we'd get a very solid Mania match.
As for what I'd want to happen, I'm thinking you could do Punk vs. Rock for the title, Cena vs. Undertaker, and Triple H vs. Brock
I'm not sure though.