Moyu on 24 October 2014
It's not the X1/Wii U.
Yes, I do believe those 2 consoles still have a very "toxic" aura surrounding them to this day, and the PS4 coupled with good word of mouth as well as good marketing simply made it the better choice in the mind of your average consumer.
Plus "Playstation" as a brand is much bigger than the "Wii" brand or "Xbox" brand WW.
Edit: typo
