Any particular brands to avoid?
I own a .30 cal and 5.56 cal can, from Yankee Hill Machine. To be practical; I could have purchased the .30 and saved about $1400. The .30 works almost as good on 5.56 or .223 & I do use it on one .223 Wylde barrel which I purchased with the same thread as is common on .308 rifles. The barrel builder suggested that as he felt that thread pitch provided superior holding power over the standard pitch on AR platforms.
My suggestion to you is:
1. Determine what caliber or calibers you need a can in.
2. Buy a can that is rated, in your caliber for any cartridge in its range, min to max. i.e., anything up to or including one certified for full auto. Why; refer to the adage: Buy once, cry once.
3. If you are buying only one, or even more than one, and for example wish to use a .30cal on a .223. Make certain (And I should have said--if you are going with QD, quick detach, systems) That your choice of mfgs offers QD adapters in the different thread pitches for the rifles you intend to use.
4. In other words, IMHO: Best not to mix and match brands of suppressors. And even when buying from the same mfg, make sure that not only there are QDs for different thread pitched barrels, that those QD adapters will accept the particular model you are buying. Most mfgs make several models in the same caliber, but the different models may not all fit on all of the adapters.
I can suppress most of my long guns except those in .22LR, and don't like to fool with thread protectors and certainly cannot afford to have a suppressor dedicated to each rifle, so I like the QD systems.
I'd even suppress my .22LR gear, but would hate to have that kind of money tired up in the ATF's pipeline and croak before my approvals arrived. The older you get, the more "timing is everything" applies.
Deciding how many you want, what calibers you want, what you intend to use them on and whose brand you choose requires a well thought of plan, in advance, to avoid buyers remorse.
Good luck with your plan. Some calibers can be fired suppressed outdoors with minimal ear protection. Indoors or under an outdoor roof, full protection is best.