Aloha,
There’s several different manufacturers of moderator’s out there, as for which one is the best is hard to determine. I have DonnyFL, Hugget, and Neil Clague moderators but they all sound different for each gun. The DonnyFL on my veteran, cricket, and uragan sound the quietest, the Hugget on my bantam sounds the quietest, and the Clague on my slayer sounds the quietest. I would have to say DonnyFL would be your best bet as that’s what most guys put on their Hatsan’s.
Aloha, Keone