Which App Store region is best for accessing all Apple Music tracks?

I recently had to switch regions on the App Store and ran into a few issues. Most importantly, some of my Apple Music tracks are no longer available. I can't switch back to my original region because of payment issues, but I can choose another region. So, which one should I choose to get rid of these restrictions? Is there a website or tool that can help me find out which regions have the songs I want and which don't?

[Re-Titled by Moderator]