So, what do you think? What cans should I be considering?
My $0.02.
I prefer Ti for weight and depending on the model it's usually fine for most firing schedules unless you are a really fast, sustained CQC/3-gun type shooter or have an auto. The sparks go away after a few hundred rounds, but can come back for a while after cleaning, so that is probably why there are varying reports.
If you really don't care about weight, steel cans are generally cheaper and depending on the model generally hold up under higher rate firing schedules as compared to Ti, but you need to ask yourself if you really shoot that fast for that long.
For high back pressure, very quiet cans I like DD Enticer L-Ti (very quiet and good value) and TBAC Magnus (a gold standard, but much heavier and at the high end of price range). It's always an apples to oranges comparison for sound level, but in my view these cans are similar in suppression level. The steel version of the Enticer L is a relative bargain. I purchased these strictly for bolt guns due to the high back pressure. Some run high back pressure cans like these on gas guns, but not me. If you try use an adjustable gas block system with a wide range of adjustment, and don't be surprised to have a lot more gas in your face.
For moderate/lower end of back pressure suitable for ARs but still "quiet enough", I like KGM R30. This has about 8-9 dB lower suppression performance than the Enticer L and Magnus, which is very significant, but there are other advantages besides the lower back pressure. The R30 is light, durable (for Ti) and has better recoil reduction than most suppressors due to the radial venting at the end cap. If you can give up an additional 4dB you can go to the R30K and save some length and a couple ounces while picking up noticeable additional recoil reduction (maybe 45% for R30K vs 40% for R30 - compare this to 60% from the best muzzle brakes and significantly less than 40% for most suppressors). The radial venting on both models can also be tuned with set screws to mitigate muzzle rise and lateral movement, to a degree. Both of these models are hub compatible so they will work with most adapters and quick connect mounts if that is your cup of tea, or if you like direct thread (my general choice). Middle of price range if you can find them on sale, upper middle at list. KGM went dark in the retail market for about a year while they expanded their business with LE/M customers and they are now re-launching retail. KGM has a new dedicated 556 can coming out that is supposed to be better than their old 556 model, but from what I hear it will not be as good for suppression and recoil as the R-30 line, so I like the more versatile, higher performance can even for 556 duty.
Also at about 8-9dB less suppression than the Enticer L-Ti and Magnus, DD Enticer S-Ti is a price performer in the moderate/lower end of the back pressure performance, but with less recoil reduction and no muzzle tuning as compared to KGM R line. The steel version is even less expensive. The performance for this can is somewhere in between the Ultra 5 and Ultra 7, and it's considerably less expensive.
I just ordered a CAT ODB because I couldn't resist trying it given the way it is reported to defy the performance bounds for very low back pressure cans. This has very low back pressure but still seems to perform like a moderate back pressure can, and is reported to have very low FRP. There is very little comparative review information vs the KGM, so I decided to find out for myself. Can't say one way or the other until I compare side by side with other cans so I can't recommend it.
For mounting solutions, I like the area 419 although I don't use it on all weapons and mostly go with direct thread. The A419 is nice because you don't have to keep the weight of a brake when you mount a suppressor and the adapter is lighter and shorter than most others. It's not as "quick connect" as brake adapters like KeyMo, but it's quick enough and the Hellfire Match is an "almost as good" contender for recoil reduction and muzzle rise whereas brakes like the KeyMo are way less effective than best of breed (like the APA FB, MPA DN5, etc).