Whew...what a tricky article to read! I thought I understood the differences between Google Drive and Dropbox until I read the article.
Currently I use both Google Drive and Dropbox and like them both. The first grade teachers at my school use Dropbox for those large files that can't be emailed and when we don't want to walk to each other's room with a jump drive. We also recently used Dropbox since we were issued new laptops and needed to get our old files onto our new computers. Personally, I like Dropbox because it reminds me quite simply of a "Documents" folder and is easy to navigate and make changes to.
Google Drive, on the other hand, is a little bit less user-friendly than Dropbox but I enjoy using it just the same. At our school, we use a shared document on Google Drive to sign up for iPad carts. After county-wide collaboration meetings, we also share teacher-made assessments using Google Drive.
While I am more comfortable with Dropbox, I think the more I utilize Google Drive, the more I will see the practical uses it offers.