Xenoblade X's gameplay isn't for everyone, but personally I really like it. More than Ao no Kiseki's, by a fair bit.
However, Xenoblade X's villains are..well, weak. Ao no Kiseki wins in that regard by a gigantic landslide.
So combining both categories, Ao no Kiseki gets my vote, as I feel stronger about its superiority in the villains department than I do about Xenoblade X's superiority in the gameplay department.