Everyone hates on Microsoft, but their platform is 50x better than Google. Personally nowadays I would be looking at Proton if I was going to setup a workspace for my company.
We are 365 shop… I cannot think of one single time the 365 being down has affected us at all. Maybe you’re right I don’t know. Maybe your region is worse than my region.
Then I would gather you don't rely on mail like many of their customers. Just do a simple search of M365 outages and you'll get plenty just in the last year.
Maybe MS actually has support. The UI is so much worse than Google's (which is bad enough for communication compared to Slack) that you just cannot win though.
I have to say, I’m finding the “New Outlook” deeply unsatisfying coming from a GSuite company the past 4 years. MS was better in 2021 than it is now. The new one reeks of Jony Ive style minimalism. I constantly can’t find anything I need, and it takes a lot of fiddling to do simple things.
I generally have rooted for MS over GOOG on this type of thing, so I am not saying this out of fanboyism.
Outlook eats Gmail for breakfast.
The way shared accounts, lists, and work assignments are done in Outlook require their backend (share point inheritance), and google drive is pretty good even for some small files, but when all is considered O365 wins.
Then if you are in Europe, you should not use any of those and other very good solutions are currently growing super fast.