Just an anecdote but my experience has been diametrically opposite to yours. My last role was in an office 365 shop and I miss it every single day. Most of the pain in Google-land comes from meet/chat and everything being in the browser.

My organisation has used 365 for the last two or so years (after migration from Google) and I can't say I've noticed much difference in reliability between the two. Google has their bad days as well. What in particular have you noticed?

I call it Office361 because it goes down at least 4 days a year.

Not sure why I have the opposite experience. We transitioned from self hosted Exchange to Office 365 and then Teams a few years ago, and I don't even remember a single instance of an outage.

This is my experience as well since the BPoS days…

Not that it matters. Companies on the Microsoft stack just tolerate the outages so they can keep using Microsoft for everything.