Honestly, Frozen. I didn't really find any of the Big Hero 6 characters relatable to my own life, unlike Frozen. It was a cute movie, but it's not quite as good as Frozen in my opinion.
Big Hero 6 because it has robotics and I like the plot. In Frozen, the idea is pretty good, but the plot is too simple and you can guess what happens at the end.
So depressing though.. T^T