Dragonball Z: Battle Of The Gods - This is secretly an original Dragonball movie with the "Z" tag. Most of it light comedy with very little fighting, with the fighting itself never having much threat. Having watched Broly, the shortcoming of the animation really comes apparent.
Dragonball Z: Resurrection F- It's abit plot thin and they don't really do anything interesting with Freiza. The fighting are scenes are better than Battle Of The Gods. I prefer the series version, even though the animation quality is far worse, it's more drawn out with better build up.
Of these two Battle Of The Gods was better, mainly for the humor and the two newly introduced characters. Broly is basically Resurrection F, but doing something interesting with a much better plot and animation that blows it out of the water.