What is the best Gcam combination (gcam, XML and maybe magisk module) if you are running PixelExperience with magisk?
Urnyx builds are now considered as the one to go for
https://www.celsoazevedo.com/files/android/google-camera/dev-urnyx05/
I don't think it will make much difference which ROM you are on as to the quality.
As for xml config there's a few to choose from now, that users have uploaded to the above site. I think it's a case of trial and error to see which you prefer. I can't comment, as the last time I looked, only a couple of weeks ago, there was only 2, now there's 10 files, so I haven't tried most of them.
There is a 48MP fix Magisk module in the camera fixes section of the website, to enable 48MP shooting.