The Small/Medium/Large Google Apps/Office 365 Suitable Enterprise Size columns don't specify if one service is better than the other, but rather just states if I feel a feature is appropriate for that size enterprise. Actually, for small and medium enterprises, I might even say that Google Apps is better, because of some of the very reasons you'll suggest. However, when it comes to large enterprises, where certain users may have more advance requirements, Google Apps doesn't make the grade. And even as expensive as Office can be, it makes weight.
BTW, you might want to check back over the course of the next couple of weeks for a post I've written on Google Cloud Storage, which is essentially Google Drive's medium-to-large enterprise equivalent service.
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