I see where Jason is coming from and I agree with him. Take the hourly chart PS4 at #9, Xbox is at 31 73, and 83. Most people in here would say PS4 is "winning" the hourly chart. And they would express this OPINION as a FACT. It is not a fact at all. There is no possible way to know if the combined sales of 31, 73, and 83 outsell #9. To me all he is saying is it is not a fact that PS4 is winning on amazon. Would you put ur child's life(or someone important to you) on the statement 'PS4 is selling better than Xbox one on amazon'. I wouldn't.
With that being said PS4 is 'likely' winning on amazon. But here is something I just noticed on amazon. There is total(by my count) of 9 different options to buy a new PS4 on amazon. 7 if you exclude sold out bundles and bundles over 1k(vr bundle). There are 40 different option to buy a new Xbox on amazon. That is right 40. So I don't think it's light and day which console has more total sales on amazon when there are so many sku's and no actual number on sales besides a position ranking to 100.
edit- of course these are just my thoughts and opinions. Are they wrong, maybe, maybe not.
Halo MCC will sell 5+ million copies(including digital)
halo 5 will sell 10 million copies(including digital)
x1 will pass ps4 in USA, and UK.