FOR ME... I rank everyone into one of three tiers. This is not a rule, rather how I PERSONALLY decide to buy a can
3. Small shop. Griffin, Huntertown Arms, Liberty, Templar, TBAC. There CAN be good products here. TBAC is a great example, they're quite, but expensive, Ti, very niche. Others in this group are plain shit, they lack the tools, processes, coatings, testing, and execution of the big boys. You have no idea if any of them will be around in 5 years to service your LIFETIME silencer.
2. Bulk production / Medium quality. Gemtech, YHM, AWC, and the like. The size of the shop has nothing to do with this. These are almost never top of the line cans. Although there can be rare gems like the Gemtech MK-9K, a very good can albeit like 20-some years old. These companies exist to serve a lower price point. Gemtech is a good example as they have some competitive cans, but I don't think I've ever seen a 100% finished product, it's always that last 5-10% that takes all the work - I see most of these companies put out 90% products. They're plenty fine for almost everyone including some military, but as a civilian remember you are buying a LIFETIME product!
1. Big Boys. Surefire, AAC, KAC, Silencerco/SWR. In my opinion, unless you have a very specific use that a small shop can only fill, these are the only cans I would consider. That said, AAC has been dragging their feet on a new design since 2007-2008, so I wouldn't buy their cans right now, except for the newer Ti cans. Not every can in this group is a winner, some are shitty price/performance like the KAC NT4. But to me, it was clear, the new Surefire Socom line was all I'd ever need for rifle cans. Saker line would be good with a 762 part.
*Some companies like SAS, Ops Inc, and others might float between 2 and 3 even per product.
Griffen imo, is a small shop that will never be able to compete in quality to the big boys. These are lifetime purchases, choose wisely.