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