I would most likely take a 1C since it is less blue. But if you are a tint snob it can always be a little lottery how the tint will look.
I have my fingers crossed that someone (Fasttech or Intl-outdoor) will get U2 in 5700k at a decent price. The bare emitter is already added in the BLF LED database (if you choose to see all XM-L2 emitters)