I haven't checked through the entire thread but from most of the posts I see, people are expecting/wanting Edge to get the victory here. I will go the other way.
I do agree that the match has the chance at being very good and both men could put on a stellar contest that ranks high by the end of the night. I feel though that Orton needs the victory more.
They are doing a really good job with this new "face" Orton. I put that word in quotes because while he is a face, he is by no means the regular definition of one. This is his second real feud (Swagger was the first and that ended up with a loss) and I feel as though a win here will really continue the momentum he has. A loss for Edge will not hurt him because if you look back at history, each time Edge fails to win at something, he comes back and gains all his heat by doing something opportunistic. He doesn't need a clean win here at all.
Furthermore, the next few PPV's are all evens that do not lend itself to typical one-on-one matches. When you consider the ideas of the PPV's (Fatal Four Way, MITB), it seems like main eventers such as Orton and Edge will be involved in those matches. I don't see them going one-on-one again until at the earliest, SummerSlam. So, sure, these two could continue the feud through the summer but I think WWE has other plans for the two of them by putting them in the championship race. We still don't know exactly what role someone like HHH will play as well when he returns, as he could very well end up in a program with Edge. And Orton could end up in a program with Sheamus.
I do believe from the way Orton has been booked in the last few episodes of RAW, Edge will go over because that's just the way WWE books it. The person who gets the upper hand the most in a feud loses at the PPV. So in that sense, my money bet would be Edge. My hope and the right booking in my opinion, is Orton.
I am looking forward to it though more than any other match on the card.