It has the worst commenting and track history I've seen. My company went to Google docs about 5 years ago and I have steadily walked the work product of engineers go downhill because of it.
For what reasons? I've used both and never seen such a thing. In fact I'd argue the simplicity and collaboration features of Google Docs gives it an edge.
One issue is information density of the UI, the other is that text edits are embedded as comments.
I think it is great for planning a birthday party. Less so for critical engineering documentation when lives are on the line. My experience is that sloppy imprecise tools lead to sloppy imprecise work.