Interpretation

In classical music there can be  a plethora of performances of the same popular work, each one differing in interpretation and sound quality.  The question is which performance are you going to buy or stream? What are the criteria that will influence you? How important is sound quality?  Or Is interpretation your primary concern?  Of course the ideal is get a combination of both,  

I am in the midst of comparing complete sets of Mozart piano concertos and the old favorites such  as Brendel and Perahia are great but lacking in modern sound .So I find myself gravitating more towards later  good  interpretations in better sound 

So, which do you lean towards?