A colleague just had google drive not properly syncing for 2 weeks, and all of the sudden it started working except it overwrote a very active Sketch file with the two week old copy (and no duplicate "conflict" copy made as Dropbox does). Google around and you'll find many such stories across all services.
Another thing the OP hasn't mentioned is which service he/she will move to. Dropbox is by far the best file sharing/storage product I have used. I don't think about sharing/storing files anymore - all the tools and convenience Dropbox offers (and Finder integration is a big part of that) take care of this itself!
Now you have the ability to selected nested folders to sync, it does everything I need, and the storage is shared with Gmail, Photos, etc.
* It does not do chunked syncing. Change one bit of a 5GB file, it gets resynced completely.
* You cannot get a list of shared files/folders. You basically need to check sharing per file/folder by hand or write/use a Google Apps script (which is very slow).
* It does not support LAN sync. When I share large directories with colleagues on Dropbox, sync is very quick, because the transfers are just over the local network.
* The last time I tried, the Google Drive client regularly had problems syncing some files when syncing a very large set of files.
(* There is no first-party client for Linux.)