Well none of these are my all time favorite movie (or even close to it). If however you mean my favorite transformers movie... I'd say it's a toss up between TF the movie (86) and ROTF. TF the movie is the only one of the 4 I enjoy sitting through in it's entirety. ROTF is absolutely the least watchable of the movies, but it has the best action scenes/robot fights of any of them, and isn't that really what we want from these movies?