Hey guys, I've been playing shmups for a few years now, and I've yet to play Battle Garegga. But I really want to!

I'm trying to figure out the best way to play this game and it seems like this M2 Shottriggers version is it. My problem is that I currently only have a Switch; no PS4/5 and no good gaming PC(if I wanted to emulate). Anyway, I'm considering tracking down a PS4 so that I can play Shottriggers Garegga, and maybe even enjoy some of the other M2 stuff that isn't on Switch.
A couple of questions:
Are there any differences between the content that is included with the digital version vs. the physical version? I seem to remember reading somewhere that the digital version did not include the Rev.2016 Perfect Edition soundtrack. Is this the case? I'm not a collector and just want to play this game with the best version I can get for a reasonable price. After looking, it seems that there are 2 decent options. I'm in the US, and I see a localized digital version on the Playstation store for $34.99. I also see a Korean physical version on Play Asia for $49.99. Any recommendations on which one to go with? Is it true that not all of the 4 soundtracks are available with the localized US digital version? And while I'm at it, any content differences with the other PS4-exclusive Shottriggers releases between physical and digital?
Also, I may be interested in future Shottriggers releases or other good future shmup releases. Should I consider getting a PS5 instead of a PS4 to be better set up for what the future may bring? Or is the PS4 good enough? Ideas about PS4 versions with regard to enjoying these games the best you can?
Anyway, that is a little long-winded. Sorry, I'm a bit of a noob!
