Firstly where did i state which will sell more? I merely pointed out that history has never favored the most powerful console yet so many here are acting as if ps4's power is it's most important factor.
Secondly they are not equal in feature set, one comes with kinect.
the other one comes with touchpad in the controller for example. I wonder which feature do gamers may find more useful.
As for powerful consoles being sent to die in favor of weaker ones.... that is a very simplistic way to see how things are:
Wii was aimed at casuals and was cheaper than competition, but hasn't been relevant for a few years
PS2 launched more than one year before competition and followed PSone success.
PSone also launched way before n64 , was more powerful and cheap than saturn (or at least more friendly to developers than saturn)
Snes was 'more' powerful than Genesis (well, not exactly, but most games looked better on it)
ALso people comparing this to ps360 situation is lol worthy. PS3 was hard to develop for, everyone knows that, even being more powerful because of cell (gpu wasn't afaik)
Xbone and ps4 are very similar, and the main differences are raw power and how ram works, and this seems to make XBone a little harder to develop for, but nothing close to ps360 levels.
And then there's 100€ difference, and a significant difference in availability at launch