We use different AWS accounts for different purposes at work. It would be an extreme productivity loss if I had to go back to using something other than Firefox's containers.
Other than separate windows... is it very different if we use different Chrome user profiles to keep the saved logins, sessions, and cookies separate?
I use a combination of both every day at work.
I like chrome for some things too because you can make a single-site-browser window in chrome, so certain websites can be treated like first class applications in the alt tab menu.