ROTW, because it's harder to watch both runs and you can't see each style, each mistakes and ... practically if you want to see something you will chose one jumper and watch only him. Nobody will watch again the movie.. (or 95% not)...
I accidentally voted BOTW. I was going to choose ROTW.
Why? Simply, because its the simplest one! No need to pick the most interesting battles among all the great runs out there, less trouble for the moviemaker, easier to see what the guys are doing (I hate battlemovies! They're difficult to follow).
There are some upsides to a battle, too... for example it has more tags (2 players' names') in YouTube and therefore it would get more views by Search and through that Cosy-Climbing would get more attention, but a battle is still the worse option for me, personally.