Oh, and one cannot overlook the power of Excel lock-in here - the number of business lines run on excel macros in this country is staggering...
My current company was on Google apps for about 2 years and then switched to Office for the last 2 years. I can't say MS is better at everything, but overall I definitely prefer it.
I will say the "cloud" evolution of Microsoft Office is annoying. Every time I start a new document it wants to default to saving it to OneDrive and pops up a login window. I just want to work on local files, dammit.
My employer is trying to roll out O365 to the enterprise. Some of us have been using Google without official IT blessing (due to needing to get shit done in the absence of an official solution) for years.
The biggest pain point so far as been moving from Hangouts to Skype for chat. The UI on Skype is awful - multiple pop up's instead of one page (https://hangouts.google.com/), a native client that wants to update way too often vs a website, and for some reason every new conversation with someone starts a new window even if the person already has one open. It's a joke.
Which client? The OSX client appears to have very limited configuration options.
MS is way better at support, which is a crucial factor in business. Our small company we have found that G Suite had almost non-existent support from Google.
Finding a human at Google to talk to, or even reply to a forum post is very difficult.
I've contacted Google Support for a lot of issues (some insanely trivial, and some pretty complicated - both via phone and chat and they have yet to disappoint me).
MS has always been in the enterprise world and they've honed their skills on it. But imo, G Suite is not too far behind when it comes to support - but it is lacking in other areas - like not having native apps.
[0] https://support.google.com/a/?hl=en#topic=29157&contact=1
So you are comparing a no-risk (since you can always fall back to the native apps) negligible cost solution to the google solution