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So basically, if all of the cities decided to duke it out with their champions who would win? Note: the city that a champion is the most closely affiliated with would be their "home" city. Ex: Kennen would count as a part of Ionia, not Bandle City and Sona would be Demacian, not Ionian.
Personally, I think Ionia and Demacia would probably be the top, with their even spread of excellent champions filling every role (with Ionia missing a ranged AD carry :-/)