Shelter 501 MkII or Grado Sonata?

Have been a long time Grado Sonata user on Oracle Delphi Mk 5 with Morch UP-4 arm. I am considering the Shelter 501 Mk II. Anyone have any experience with these two cartridges. I assume the Shelter will track better, but have a hard time believing it will do female voices as well as the Grado. Thanks for your time.