Who should and who will face Daniel Bryan at Wrestlemania are really two totally different things but either way, I'm personally leaning towards John Cena, mostly for the simple fact that this is the grandest stage of them all and obviously the perfect time and place for Cena to break Ric Flair's record and capture the gold for the 17th time...
If it were up to me, I'd probably keep Daniel Bryan champion even until Summerslam but, as noted above, this is more an issue of who WILL rather then who SHOULD and me thinks it's highly unlikely John Cena will miss out from the party, more so given the events from last year and how he basically got squashed by the Undertaker...