To start off some LTD's as of November
3DS: 13.33m
PS4: 5.62m
XB1: 4.9m
3DS:
Reasons for: It has a huge lead of around 8m units
Reasons against: It's past its best in the US (sales are dropping YOY)
PS4:
Reasons for: It sold well all year round.
Reasons against: Currently, XB1 has momentum. Whether this remains is to be seen.
XB1:
Reasons for: Has clawed back some of the lead, has shown it can sell very well in the states.
Reasons against: PS4 can easily take back the lead
In terms of 3DS, whilst it is only 6m (after December) away from 20m, it has also only sold 2.5m - 3m this year in the US. Also like I said before, its best sales are behind it (no, new 3DS is NOT going to revive sales.) Its peak year was its FIRST year and even that was barely above 4m. If sales taper off even more this year it may not even potentially hit 20m.
PS4 Vs XB1 is really anyones guess and depends entirely on what MS and Sony do. They're almost neck and neck and are both popular in the states. Even selling the average 5m a year tho we're talking mid 2017 for both.
