my ps4 is laying down i did have the ps2 standing when it was the new thing but never really carried it on, didnt know it was still a thing haha
Usually depends on the orientation of the disc drive for me. I like them horizontal, so whichever way allows that. My PC tower stands up, My Xbox 360 lays flat. Oddly though I have my original Wii system standing despite the disk drive being vertical when it does that.
As I learned from a broken PS3, when you stand some types of consoles up for a long time it can cause the disk slot to break and no longer accept disks being put into it. I guess it gets out of alignment somehow. So now I lay everything down.