hmmm...that isn't the real asian hulk. Begone impostor!
I'll say Thor. Him and Supes are about equal, but Mjolnir (magic) I think would be the deciding factor. Wizard magazine has him higher too...I know that means jack-sh*t most of the time, but it's something.
Don't know much about Orion...but my gut tells me he'd lose to either one.
-DM