Of course neither of these albums were released with their original mixes. As they were released, I've never been super fond of the sound of either. They're terrific batches of songs, so that fact has never wrecked the music for me. I suppose In Utero wins, but it sounds really weird.
The original mixes of In Utero sound great. At the very least, they sound more real, more dynamic, more powerful than the version remixed by Scott Litt. "Milk It" sounds almost like The Jesus Lizard. The end coda of "All Apologies" is full of little details that were drowned out by the over-compressed guitar (bits of acoustic guitar and cello can be more clearly heard, and the effect is ghostly). The drumming of "Radio Friendly Unit Shifter" smacks thine face yet more so. I think you can buy the vinyl with original mixes here
, but I'm no longer sure - the product page previously stated that it was the Universal Back To Black reissue, and now has no such information. One friend of mine purchased it from here, and got the right thing, but they seem to have removed all relevant info...
I've heard only a couple of the original Nevermind mixes, and I will hear them all when they are released this fall. What I've heard sounds fantastic. But I must reserve my vote until I hear them all. Butch Vig knew how to mix a damn record once.