Having seen all of them here is my opinon
I was not impressed with show and prove, it is a decent ski movie, and alot of people loved it, I on the other hand thought that the voice overs got a bit repetitive and the movie seemed to drag on. There was nothing special about it. Untill Seth and Tanners last BC heli segment, I bought the moie for that segment alone, and don't regret it at all. It was great to see seth back on top of his game, and Tanner was killing it as well.
Massive is much better then Show and Prove, it has a good flow to it and a
nice verity of skiing, with a little more emphasis on powder and big
mountain. It is still a great movie but not up there with the
amaziness that is believe.
I would say Believe is the by far the best, it is almost untouchable. It is one of the best if not the best ski movie ever made. easily up there with the likes of ski movie 3, and session 1242. Beats out the other two by a long shot. The flow and the pure epicness of the skiing made it unforgetable. When making it they did nothing wrong and everything right. Everyone should see this movie.