The Ti-Rant is a very good can, but that's not a good reason to get one. Most major manufacturers offer pistons in all those calibers, but AAC doesn't offer one in 5/8x24 for use on 300 Blackout subs, whereas many others do. The one aftermarket option available is for the Ti-Rant .45 only and not the 9mm.
Also, keep in mind that AAC doesn't officially rate the Ti-Rant for use on 300 Blackout, so if something goes wrong they probably won't cover the damage. Whereas companies like SilencerCo do rate their cans for 300 Blackout subs, so you're not voiding the warranty that way.
Also, when it comes to interchangeably, there's one really annoying thing about the Ti-Rant: The pistons for the .45 and 9mm are different, whereas there's no difference between the mounts for the Octane or Osprey in 9mm or .45. This makes availability of mounts more difficult and complicated with the T-Rant.
Basically what I'm trying to say is that the Ti-Rant has fewer mounting options and more proprietary mounts than pistol cans from other companies. But otherwise it's a good can.