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Drum Brain AUv3?
I'm looking for an acoustic drum plug-in that would work similar to BFD or Toontrack or any of these other 'drum brain' like VST's we see on the Mac. I've pretty much narrowed down my search to Slammer or FAC Drumkit. My plan is to trigger the sounds via drum triggers. Curious if anyone has experience doing this on iOS? How do these two apps compare? I like the flexibility and sound design I've seen in FAC Drumkit, however, I like the immediacy and sounds I've heard coming out of Slammer and Ting.
I'll be using the class compliant Audiofront eDrumin4 trigger to USB converter.

Comments
Check DrumPerfectPro comprehensive sequencer and multiple velocities on samples
The closest you can get is audiolayer imo.
It can manage large sample libraries provided those are innexs or sfz format. It handles large number of velocity layers and round robins.
DigiStix 2 has 5 velocity layers, paired with the right samples it should be enough for most cases. For samples you have some very good libs in Drumdrops. There’s some excellent free ones around should you want to try, Reverb has some good ones: https://reverb.com/software/samples-and-loops/reverb/3214-studio-sampled-sounds-hitsville-usa-in-detroit-mi-by-ian-ballard
AudioLayer is great but it doesn’t support multi-out. If you don’t need to individually add fx and so on it’s a great option. Drambo too, of course, can do it all you know… but it does take some time to get a kit working.
Ah, yes...Audiolayer! I forgot about that one. Nice to have that on iOS...never mastered it...will revisit.
Multi-out is key...Random non-repeating round robbins are key too...
Don’t know about DrumPerfect but I’m not aware of any app that can do both, velocity layers AND round robin. That would make for the most realistic and I guess that’s the case with “bigger” desktop plugins like BFD or Addictive Drums. I don’t know of sample libraries that include both either.
There's an IAA called Barbaxdrums which you can find here
https://apps.apple.com/gb/app/barbaxdrums/id1475341878
Though you requested an auv3 you could run
this on another device and send midi to it
and record the analog signal.
It's got some good sounding drums.
DrumPerfect Pro has up to 8 velocity layers and round robin and is multiout. AudioLayer has both velocity layers and round robin.
I didn’t know you could do both Velocity layers and round robin simultaneously in AudioLayer. Thanks for that!
In case it helps anyone and just to confirm: You tag any layers in a given key with “round robin” or “random”. Each of those can in turn can in turn have X velocity samples. It will then play, for example, the sample for vel 80 in layer SNtop-1 then the sample for vel 80 in SNtop-2 and so on…
You mention Slammer. It obviously has velocity layers and (non-repeating, random) round-robin, having more than 2000 samples for the 30 instruments. But you can't import your own samples, you must sequence externally, and you'll need to use extra instances instead of multi-out if that is a must.
My suggestion would be the 'Acoustic Drum Pack' In Beathawk. Great sounds and dynamics.