I've got the OG6S and REALLY like it on my 243! Probably my favorite can right now, and I have a bunch. I will for sure be buying the OG 22 caliber can when it comes out.
I have a ZG Nano and ZG6.5 on order after shooting one of my buddies Nano but have not shot it next to the OG6S. It was very impressive for it's size, won't go wrong with that one.
Ultimately, if you want one soon, go with the OG6S and you'll be happy, if you don't mind the wait, get on a list for the ZG Nano, or wait for the OG 22. Any way you go, you'll be happy I'm sure. Only thing I can say is go the 3D printed route, I've got a few (OG6S, Reaper, Rhodie 6, B&T Tiger) and they out perform all my newer (wolfhunter, DD LTi, Polonium, Omega, Raptor 8) old school baffle cans by a good margin. It's a great time in the suppressor world!!