I've asked myself this same question. I doubt there's a singular answer, but I basically save my vinyl purchasing for analog recordings only. There are exceptions, but that's my rule of thumb. Just seems like the sonic benefits are maximized when the album was recorded to analog tape.
Digitally recorded vinyl vs streaming
I know this is an hot button for many, but here goes... I like vinyl and have many albums from the 60's, 70's and 80's. I'm interested in some 80's and 90's albums - like U2, REM, Nirvana, but I wonder if they will sound any better than streaming since they were probably recored digitally.