Quattro Fil or Frey?

I am looking for advice re: Nordost Quattro Fil and Frey. I currently have Quattro Fil's between my source and pre-amp and pre-amp and amp, but I've been hearing good things about the Frey. The Quattro Fil is very detailed and airy, but maybe lacking a little on the "musical" side. Wondering how the Frey compares.