It’s been plaguing me for days.
1) I’d choose "Video Game Music" If the game uses actual music from a movie-franchise (first example of this which comes to my mind: some of those Star Wars-themed games);
or
2) Pick a section over the other after I’ve verified what kind of media "has" the highest number of tracks featured on the album.
3) Just pick one, it wouldn’t really matter since the "material" can technically be placed in both sections.