i expect the PS4 slim to sell like crazy.

lol yes sir, just because of amazon and no other reason the ps4 will outsell the xbox one in the united states. 

But that's what your post said.

I only mentioned Amazon, but the Xbox One was the best selling console in general for the month of December, just like how you mention the PS4 is selling the best currently.

So by that logic ps4 has already won, they did win amazon + NPD 11 times in a row already.

Exactly, that's my point. What is the point of this thread then.

i also mentioned that the ps4 is beating the xbox one on all major retailers despite the fact that the xbox is $50 cheaper. i didn't think i needed to mention this, but the ps4 won every npd for ten months straight. the ps2 was also insanely popular in the united states. literally the only reason xbox brand is even as popular as it is now is because sony launched the ps3 a year later than the 360 with a $600 price, no games, worse multiplats, and major arrogance at the time. xbox one won two months because it sold at the value of a ps3. ($200)

How most of us will look, lol.  Of course, we're all going off of Amazon, which so far has had a 100% success rate.

We're talking about currently though. The PS4 has good momentum but anything can change. Microsoft went aggressive and managed to win 2 months, and now they're trying to keep it up with keeping the price drop permanent. 

It just seems like you're basing the future off of something happening currently.

"PS4 is selling the best on all stores, obviously it will win for the next 6 years or however long it's on the market for in America based on these sales just for this month".

But what has MS got to change the momentum? Sony have The Order this month and Bloodborne next month. They've already won this month (and I'm confident with that). If the price drop hasn't effected Sony's momentum then how is the price cut plus two new IPs from Sony going to change things? Momentum from Bloodborne + The Order is also likely to push through to April too. And I'm not certain what Sony has for April either.

edit: They have MLB the Show, Mortal Combat X and Dark Souls 2 releases too, which will push more PS4s than XB1 simply because it's loved by more Sony fans and Bllodborne will put people in the mood for it.

I'm not sure on who will 'win' this month because anything can happen, but my point is that basing an entire generation on one month's sales is ridiculous.

Also I have no idea what Microsoft has to change the momentum. If you were to ask me off the top of my head what Xbox One games are releasing in the next few months (Exclusive-wise) the only one I can think of is Screamride, and even then that's on the 360 as well.