Which school of magic do you prefer and why?

Again, it all depends on the map. For example, if the map is small, a portal isn't needed! Or why would you need water walking if there's no water on the map? In general, it's a pity that there isn't a skill that would immediately grant expert magic in all elements. That would be very convenient!

But it would be very uninteresting. Besides, there's more to Earth magic than just the portal. And water walking is generally useless; it's not worth taking water magic for it, but Dispel is worth it. And in Earth magic, besides the portal, there's mass slowing, earthquake, or stone skin, etc.