I have a KX3 and a PWS FSC556 QDSS. The KX3 throws all the blast DR so it is quieter but no comp. The PWS is a nice combo of their TTO comp and the flash suppression of the FSC 556. It does have some blast and noise but is very good at both...the muzzle does not move much! I am, of course, not an expert but that has worked well for me!

Sparky