Switch, though I "owned" a PS4 for a month to play Persona 5 Royal. I've now returned the PS4 to its actual owner, while conversely lending him the game itself.
Favorite games, um.
Switch: Okami. If that doesn't count, Hollow Knight. If that doesn't count, Breath of the Wild. If that doesn't count, Smash Ultimate or Astral Chain.
PS4: Persona 5.
Xbox One: ummmm