So I use one container for Google properties (gmail, YouTube, etc.), a different one for social networks other than Facebook (Twitter, Reddit, etc.), and a third for shopping (eBay, Amazon, etc.)
You can teach Firefox to always open certain URLs in a particular container so smile.amazon.com brings up the shopping container, twitter.com brings up the social one, and so on.
I've been a little sad about losing some of the old Firefox extensions but Quantum has been great.
As far as I know, Facebook Container is just more comfortable to use.
https://addons.mozilla.org/de/firefox/addon/multi-account-co...
That's a bunch of work. The more complicated or fast changing the sites in a container, the more work.
Facebook Container comes with the curation done by its maintainers. This is probably less trouble than it might be because it's not as though developers who use Facebook are unheard of.
After one day I had it up and running.
- Google - Facebook - Work - NSFW - Misc
Opening up every google service in its own google container seems like a recipe to forget once and leave google cookies in your shopping container, for example