I'm not a fan of the post-Beatles Paul McCartney, but Paul had much more financial success (even with the costly divorce) than either George or Ringo had. George probably had more critical acclaim than Paul (and, of course, Ringo), however. Ringo places third in both dimensions. I exclude John from the comparisons because his post-Beatles career was so much shorter than the others’.
Paul invested in the the publishing rights of Buddy Holly’s catalog (and other famous songs).