There is an option (and has been for a while now) to upload files to Google Drive without converting them to Google's formats. So your opaque binary blobs will stay opaque binary blobs.

That said, in my experience, Google Drive and Dropbox still differ on the handling of corner cases (e.g. symlinks, permissions and extended attributes, etc.). At the time I tested, Google Drive was lagging in most of these cases, but that may have improved by now.

At any rate: check that your use cases actually work before moving all your data!