I think the semantics of this argument matter. I don't think anyone, even the Kemba supporters argue that Kemba's talent is superior to Kyrie's. The argument essentially (esp since they are both free agents) is which guy will generate better team performance next year. Most teams would pick Kyrie, but of course it depends on salaries and the surrounding pieces. Teams needing a PG could be better off with Kemba, teams needing star power or #1 scoring options better off with Kyrie.
I do think Kyrie proved this year that he currently is a #2 guy on a championship level team, not a #1 (maybe he changes, wouldn't bet on it though). Meanwhile, Kemba has barely scratched the playoffs as #1 guy on a bad team, so there's almost no debate that he is a complimentary piece. Can Kemba be the #2 on a championship team? Maybe, Kyrie definitely.