Get yourself a can
If the rumors are true and the Virginia Beach shooter used a suppressor, it is time to buy yours now before the ATF goes all bump-stock ban on them and makes getting an NFA item impossibly difficult.
I have two now, an AAC Ti-Rant 9mm and Ti-Rant 45.
I have on order an AAC Jager 30 and have been saving up for a 762-SD.
Some things to remember about cans.
You can shoot sub caliber through them, as long as they are pressure rated for it. So if you have both a 9mm and 45 ACP, you can shoot 9mm through a 45 can without an issue, as long as you get the proper thread adapter to fit your barrel. If in doubt, get the bigger can. The sound performance is hardly changed at all. I’ve shot 9mm and 40 S&W through my Ti-Rant 45 and can’t tell the difference.
Same with rifle cans. You can shoot 5.56 through a 7.62 can. Having done so, the sound of the 5.56 bullet going supersonic is louder than the extra gas released by the slightly larger bore diameter. If a can is rated for 308 Win or 300 Win mag you can shoot 300 AAC, but not the reverse.
Rifle cans will be heavier than pistol cans and anything “full auto rated” heavier still. That is because to make a can able to handle the heat and pressure they have to use Inconel.
Rifle cans are usually (but not always) less modular and set up for one type of mount.
The Jager 30 is AAC’s newest can. It is rated for slow rate of fire shooting of up to 300 Win Mag. This is because it is made of titanium and aluminum. It is a great entry level can for someone who doesn’t want to spend much but wants more than a rimfire can.
The advantage is that it is a magnum rated rifle can for under $500, which is about the price for most rimfire cans.
My personal recommendation, if you are not sure, a good pistol can is the way to go. Pistols suppress much better than rifles because of the availability of subsonic ammo. They are also cheaper.
The Ti-Rant 45 will actually handle subsonic only 300 AAC (if you shoot supersonic through it and blow up your can, you have been warned) if you get the right thread pitch adapter.
Rimfire cans are generally entry level because of their low price.
If you want a rifle can, get the highest rated you can afford. You can always go down without an issue. If you only ever want to shoot 5.56 get a 5.56 can. If you have the inkling to shoot 300 AAC, just get a 30 cal can and be happy.
If you have any questions, just leave them in the comments. I will do my best to respond.