Between the two machines you mentioned in the OP, the PS4 has more local co op games, All of the Call Of Duty games have at least 2- player split screen.
Couch co-op games are a dying breed of game we can't forget. We reach into the depths of the library to find its best local multiplayer games. Edition supports two players locally and is guaranteed to be the best.
I'm a pc guy personally, but me and two friends just moved in together. It's a glorious mancave with a PS4 hooked to a big ass tv in the living. PC games ported over to consoles often suffer from reduced features and downgraded control schemes. Platform: Xbox One, PC. There is a single player mode, but Towerfall Ascension was built from the ground up as a Super Smash Bros. Its well worth the cheap price and while not very deep its easy to learn and ton of fun. Need an extra life? 13 Greatest Couch Co-Op Games