Xbox 360 was around 2.5M while Xbox One is around 3M at the same time in Europe.
Xbox 360 was around 1M while Xbox One is around 1.30M at the same time in Rest of the World.

I think that the Xbox One will just take the lead with around 88 Million units sold.

I don't think we can use the current aligned sales of PS360 vs PS4/X1 as a trend. Unless we assume X1 would do 90M and PS4 around 160M since that's closer to the current numbers, even if it's unrealistic.

Moved the thread into Sales Discussion.

This is a good question actually but I'll give the nod to PSP for now.

PSP by a large margin.

LMFAO, what The fuck is this thread, seriusly people expect XBO to sell 80,000,000???
XBO will be lucky if will sell half of PSP sales.
30,000,000 to 35,000,000 is my prediction, Maaaaaaaaaaaaaaaaaaaaaaybe 40,000,000, not more.

I Would say the psp

Depends on how long the generation lasts. If it lasts as long as 7th generation then maybe. If its shorter this time around, then no.

It does amaze me how well PSP did though, specially in the early years. No idea why Sony stopped supporting their handhelds

Unfortunately, probably the PSP, though that was cheaper and actually sold in Japan.

the reason the PSP did so well is that it was a very efficient multi-media handheld device in a time period in which smart phones were not yet prominent. I would wager just as many people bought PSPs for the ability to watch mini DVDs and internet cabapilities than that did for video gaming. Obviously today when Sony releases a handheld (cough the Vita) its users ALREADY have a smartphone in which they can do many multi-media things and will only be buying the handheld for gaming. Sony doesn't have a huge name in the handheld industry in terms of games specific for handhelds that are a must buy