On Firefox you can have multiple containers on a single window. On brave each profile has its own window.

That's actually how I wish FF containers worked. (As it is, I haven't gotten into using them.)

about:profiles

I don't think they can be compared. Brave profiles (well, Chrome profiles) are basically different browsers. They share nothing. They can have different settings, they can run a different set of addons, etc.

And that is why I love it

you cann probably do the same on ff and chrome by using different data directories (running with --profile or --user-data-dir options)

Yeah you can create as many profiles as you want with firefox and run independent processes with the correct command line args but most users aren't advanced or tenacious enough to set it up. It would be nice if they had a slicker implementation like chrome.