look at the exclusives per version and see which you like more! the ultra editions are enhanced versions of sun/moon with expanded storyline, new areas and endgame content, more ultra beasts and so on.

Ultra Sun and Moon revamped, and improved the nonultras story and Gameplay. I would recommend playing Ultra Sun and Moon over the originals, just because of much more polished it feels, but both are still good picks. :)

i dont know, id just say the ultra versions, but we live in a enhanced rerelease hate world, so yeah, play ultra.