Go for the Mccormack TLC-1, better than both
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Of the two you mention, I would get the Superphon and I've never heard it. I used Creeks for a while. I found them 'additive' in that the highs became a bit edge/bright. Not as neutral as you might like, but its subtle and easy to miss. I found a use for the Creek as a volume control (when I needed it) placed in the tape loop.
The TCL is a good unit as well. And the build quality is excellent. Not so for the Creek! There are many excellent passives available. Consider that IC's lenghts play a BIG role in the success in the use of passives.