Tricky question! Play the older Marios first, or start with the newer one? Or just leap straight into Breath of the Wild!?
I’d probably start with Odyssey or Zelda, to at least put the new machine through it’s paces. And probably Zelda, since it’s my favourite out of those games.
But then, you may want to use it as a buffer for something fresh between all the Mario games! I don’t know… :(