Whichever sounds better to your ears, with the rest of your recording gear, in the majority of environments in which you record, on your playback system. Not the answer for which you're looking, I'm sure, but...there it is.
Substitute the AKG caps for your question. You run them, so you can answer yourself - if you had to have only one, which would you choose: CK61 or CK63? Pick the Schoeps equivalent. They're both great caps, IMO.