I have been testing both apps extensively and I wanted to post my findings: Dropbox is much better in synchronizing files and folders on OS X. It is faster, syncs all OS X file metadata (tags too) and has no issues with the special characters in files. Dropbox offers sync over Wifi if another computer is on the same network. This feature is missing in OneDrive OneDrive isn't bad, but it lacks the OS X specific sync features. It's a shame basically, because I would like to use it, since i have 50GB space (also as part of my Office Home Premium subscription) Dropbox is much more expensive than OneDrive If you don't care about syncing OS X metadata you can certainly use OneDrive Sharing a folder to Dropbox with the OS X app is possible. OneDrive doesn't offer that functionality, unless you visit their website. I would like to use OneDrive only, but unfortunately Dropbox is too good to ignore, or better said, OneDrive is still missing important features to make it a viable, good solution for Mac users. Microsoft should improve the app asap..