I have DSD, HI Rez PCM, HDCD and CD rips of the same albums. I just give them different album titles, with the format appended to the end if they are not CDs. Not elegant, but it always works to separate the albums. When I tried to rely just on tags, I could not, at a quick glance, figure out exactly which format I was looking at. With it in the title, it is easy.
That said I do have a separate user defined tag for CD, Hi-Rez, Vinyl, MP3, Internet Radio, etc. I do not use it for separating the albums, but I do use it to label the albums in standard category view. The last line of the thumbnail text checks the user define tag and labels anything that is no a CD. That way anything other than CD stands out in the view.
That said, I do have a special view for vinyl and I do do that based on my user defined tag. But that is a special case. The tag is set automatically on import, since my vinyl files are all in a folder dedicated to vinyl.
So, different album names for sorting, user defined tag for labeling. As I said, not the most elegant, but it works.