Depends on what games he's interested in playing, obviously.Try and avoid selling if you can.
I spent a good month using my XB1 exclusively and the whole while I wish I had the PS4 in front of me.
Though I think the PS4's lineup is about to get really good over the next year or two. Been a bit disappointing up til now(for me, at least).
XB1 seems to have a strong holiday coming up, and then new Gears, but it looks a bit dry other than that.