
If you think of all the slow AMVs, pick out a few, and look at their transitions, do they all have exactly the same type of transitions? No. Which is why I agree Phantasmagoriat. I think most all transitions will differ depending on the music used and that person's style.
Of course, there are so many ways to do transitions, as I said earlier. Zoom, fade, crossfade, hard cut, masking, through the eyes, whatever. The number of transitions is infinite. But the best transition that can be used is entirely dependent on your sources (meaning you, your style, your anime and song, and even your program.) But one specific transition is not better than the other

All of this is still my opinion, of course.