Well I predict PS4 and Switch will be neck and neck, coin toss really. Those heavily discounted PS4s are already sold in Nov, so that will not impact Dec sales.
X1X has already had that rush of early adopters as well for the most part. I have a feeling MS will be dead last.
If I am right, I am becoming an analyst. Seeing someone like Pachter pull it off makes me feel like I am in the wrong work field.