I've done some extensive testing of DropBox, Google Drive & Skydrive for work.
So in summery Dropbox is slightly more that the others but you do get what you pay for.
Thanks for this. In addition, as a result of this thread, I decided to set up Google Drive to test it, since I already had an account I had never used. I downloaded the iPhone app, which installed without a hitch. I downloaded and installed the Mac app and when I launched it, I get this:
Yes, I have an internet connection. Yes, I've made sure my firewall is allowing the Google Drive app access. I'm about to restart to see if that fixes it, but I never had such an issue with Dropbox. It worked perfectly from the beginning, on every device I've ever installed it on.
Edit: Restarting did not solve the problem. Google Drive still cannot connect to the internet, even though the connection is obviously there. Also, even with Google Drive not working properly, it's still consuming more system resources than Dropbox:
Overall, I'd say Google Drive isn't worth the effort.