The Fi-156 wasn't that bad, really. I mean, as a recon plane, it worked. Just like any other though, if there was another plane in the sky it was screwed.
Saying that, the PR. XI was pretty damn good.
I'll have to say that the Me262 was the best, on the simple reason it was the most effective. The Ar234 had the potential but it wasn't enough to be worthy of the best, a great recon plane, of course but not much else.