J1 all the way, it's more rare than the C100, and it looks better IMO.
Sure, the C100 has lots of chrome and LED's, but I'm not a fan of the tweeter grills. The J1's tweeter grills look badass.
As for sound quality? Yeah the C100 has better amps, but come on, neither of them are in the M90 or Telefunken's league as far as "hifi quality" goes, so who cares. Buy the one you think looks best. And for me, that's this one:
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