I fully agree with this post. I think they have similar styles at times too - particularly Halo 4 and Halo 5's soundtracks and The Mandalorian and BOBF. Some particular pieces of music even feel like they'd fit with the other franchise.
Both also have a more consistent "feel" than most other franchises' music I've listened to. (I don't know how to describe this) but if your hear a track from SW or Halo, it's rather obvious where it's from. Well, at least from my certain point of view.
I personally prefer Halo's music to SW's (don't hate me, it's just more my style). But I definitely agree both have absolutely incredible soundtracks.