I like some of the UOGB's covers a lot, but this is simply annoying.
Superstar is a terrific song, but I've never warmed to Karen Carpenter's sugary version. Now I've just listened to the original for the first time - it gets killed by an abysmal and unnerving drum track...
I've also roamed through a shitload of covers on YouTube. Sonic Youth's rendition is probably the most interesting one (and a later version by Bonnie Bramlett is rather nifty).
But the definitive version for me remains Rita Coolidges's on the Mad Dogs & Englishmen album.
Still, it's gotta be B.
What it says on the tin.