I haven't played enough serious CC to know, but I hope to get good at both in time. Though I would suppose CC since I have the time to calculate deeper. My blitz though is pretty bad and my bullet is shameful.
it depends on what you learn on. also its easier to survey the whole board on a computer easily. also i find it easier to be creative in 3D idk why just is. i find my otb rating is better if i am given enough time. i like an hour to think minimum. i am able to handle 30 mins and still play a good game.