On your original question...I have run this experiment many times. I find that that if I can get my hands on an undamaged copy of the album on vinyl, it never sounds worse than the digital stream. This is usually true even if the album was originally recorded digitally.
That does not mean that the vinyl release sounds better 100% of the time, although it usually does. Basically, the worst possible result with the vinyl edition is that it is of the same quality as digital. If find this most frequently happens with recent releases, and usually when the digital release is of low enough quality that I was really hoping to get a big improvement with the record. I know some artists are now releasing albums at a maximum quality of 320kbs mp3, because "you can't hear the difference" by which they mean THEY can't hear the difference when plugging a pair of Sony headphones into the USB-C jack of their Macbook Pro.
The main issue with the decades you mentioned is availability. The 90s in particular seems to be an era when vinyl releases just weren't happening. Luckily the digital streams are often of good quality.