I've been going back and forth between Classic and ToughGut to go along with CoF (52/48 ).
Main reason I went to ToughGut was for durability and for me - easier to string.
However - getting better at stringing the Classic, using string savers, the durability issue is solved.
I do prefer the Classic as it plays a little softer and I can also play more aggressive with it. So I'm going back to 100% Classic w/CoF.