Frozen all the way.
1. Gravity nearly doubled expectations but it was a very unique film, shot in space and had a great director. So there was at least a tiny tiny room for a surprise run. Frozen was just another non-Pixar Disney computer animation. It was not supposed to do what it did no matter what. It took DM2 to be a sequel to a 250m movie to cross 350m and that was considered a surprise.
2. After Gravity's amazing 2nd weekend hold, it's great run started being predicted. Frozen on the other hand opened above expectations kept on surprising everyone week by week, hold by hold. Till 3 weeks after, people were saying 270+. As recently as this Monday folks were like "now 300 is a lock-in". Now it's 350.