Ethomaz's Dismantling the Myths: Amazon.com's Best Sellers is Not Accurate to the Predict Overall Hardware Sales in US (Checking: Accuracy with Software)

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IIRC 360 had more SKUs, especially by 09/10. With multiple SKUs ranking fairly high it's practically impossible to tell what sold more overall on Amazon.

XB1 also has two main SKUs, Titanfall & Standard, but Standard has ranked around #100 or lower for a while.  Thogh today an Amazon seller has the Standard at $465 and it jumped up to ~#50, while the Titanfall bundle at $499 has been falling.  Price is a big deal.  If XB1 sticks at $499 for the month of April I don't think sales can be expected like in March.