I don’t think it’s worth arguing over. From Bond to Poirot, many characters have been portrayed in different guises, and audiences seem fine accepting this multiplicity. Even Mickey Mouse himself exists in various forms, some of them quite unlike each other. Whether the live-action Ariel will prove as iconic as the animated one remains to be seen. In the meantime, I don’t think it’s controversial to say that she will make an impact on a good number of children (and adults). As far as I’m concerned, there’s room for both.