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Well, the Japanese one has a clear advantage. Like 20+ full years of experience! And she'll literally have a job until the day she dies. We can all only be envious of such job security.
Considering Sarah voiced Ash during Sinnoh and Kalos(two regions arguably considered to be the best), you have to admit that between the two English VA?s that Sarah has a slight edge. Overall though, Rica is going to win hands down for longevity, consistency and the fact the Japanese dub is just better.
I Prefer his polish Voice Actress - Hanna Kinder-kiss, everytime i hear polish Angelo i say "oh look it's Ash!"
BTW Does Ash is voiced by a man in other countries? Here in poland in session 10, Ash was voiced by Grzegorz Drojewski (the voice of TT's and TTG's Robin)