Definitely a bit of a cold take but it came to mind as 自由への賛歌 came up in my playlist again. I think Kishida Kyoudan & The Akeboshi Rockets' Touhou arranges are better than their anime OP stuff. There's something about the tone of Touhou tracks the group hits just right to properly give an active feeling.
So, Maidens' Capriccio. A damn good track with a fanmade PV that is absolutely rad. Definitely one of the standout tracks. Of course the aforementioned Aya collab track with RD-Sounds still remains my favorite overall.
https://www.youtube.com/watch?v=aaNPn70htqs
Mentioned 自由への賛歌 above, it is too good of a track to believe that it has appeared only three times. Once on a solo album, once on a compilation album, and a rather new remaster with Io as a vocalist instead of ichigo.
https://www.youtube.com/watch?v=vfOVktBwpNA