Prien wasn't a wart on O'Kane's rear end! Well, that is a bit overstated... (j/k)
To me, the Tang is fascinating, and O'Kane's writing was is so great and his patrols were so impressive, even given his tendency to overestimate some tonnage numbers.
I love Morton too, but to me, O'Kane is the greatest. Ed Beach is wonderful, and have enjoyed all the books on the Germans, espically Topp, but I am not as impressed with Prien as I am with O'Kane.
If Prien had survived and written a lovely bio., that might be a bit different, but I don't know that given Prien's Nazi attachments, that he would have been able to rehabilite himself like Galland or Topp.
I love this guy! He's the Aob king!