Google's support is a little worse, owing primarily to the fact that there is none, but Google's software has fewer headaches. And after about 8 months on Office 365 I can tell you that the most common useful help I get from MS support is along the lines of "you're right, you can't do that in Office 365, you can stop futilely searching now."

Here is a fun thing with Office365. Let's say you want not just to edit a document concurrently, but to see everybody's changes. It doesn't work right in Word online:

https://support.office.com/en-us/article/Can-I-use-Track-Cha...

I was pretty shocked to learn this. Although it seems calculated to cause you to buy a premium license, so I suppose I shouldn't be.

From what we were able to tell you couldn't/can't simultaneously edit a Word doc in 365. But it's also possible that it's more complicated than we expected, I guess. Or that the feature's since been added.

Google doesn't really have human support, for pretty much anything.