I go go off on a tangent is using a controller just plug and play ? I would like some code to get a feeling for cross platform production early on
Xbox, yes
Sony, no. I don’t know about PS4 Controller, but controller even thru it’s USB HID compatible it requires custom init command so it needs extra drivers which Sony doesn’t provide… so you need to get one made by hackers 
Anyway you should not care about it in code level (or else some platform does not use standard buttons schemes), engine input system system provide universal APIs for all game pads, so it is engine problem to support those game pads not yours. But for PC use best is Xbox
Sony is currently working on a Windows Driver for the PS4 Controller.
But you can use the Controller allready with some tools: