Well, personally I need everything. That's why I own a PC, PS4, PSV, XOne, WiiU, and 3DS. I need to play everything.
But if I was forced to choose, I'd leave the PS4 out. Its library is largely redundant when a PC is introduced into the equation, and its first-party software is hit or miss.
Well, isn't Nintendo's library pretty redundant when you mention any prior Nintendo console? I kid, I kid.
I too play on anything that has games that interest me. No matter the brand. I don,t yet have a XBO, mostly because they keep releasing their games on PC, and barely have any exclusive that stay on their console. So it's like they're almost telling me NOT to get one. -___-
Xbox One is a hard sell. And Microsoft isn't doing itself any favors by closing internal studios and releasing content on PC. It also hurts that Halo, Xbox' flagship franchise, is in decline, or that Fable seems to be lost and gone forever.
If you own a PC and PS4, there's almost no reason to get Xbox One. I'm hopeful that will change over the next 18 months. I'm bullish on Gears 4 and Scalebound. And it's possible ReCore and Sea of Thieves will be good, although both, I believe, will be playable on PC. Cuphead and Below look really good, but, again, they'll be available on PC.