IMHO Novedex XT is the ****. ATD is the best AI out there and I fully believe that for men, a suicide inhibitor of aromatase is far superior to competitive inhibitors like Arimistane.
The body handles these compounds differently and also competitive inhibitors are only supposed to play a role in breast cells while much of the male aromatase is locked in adipose tissue (fat) which I believe benefits from a suicide AI over a competitive one.