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Really, the best answer depends on what you want to do with it. Seamless integration with Windows or Mac OS X? Pick Dropbox. Seamless integration with Gmail and Google Docs? Pick Google Drive. Awesome mobile integration? Go with Box. Use Ubuntu? Go with Ubuntu One.
My personal recommendation is Box. It doesn't integrate as nicely as Dropbox does, but it has pretty good mobile integration, 5GB of free space (you used to be able to get 50GB of free space simply by installing the mobile app; I don't think that offer's available anymore...), sharing is very straightforward, and it's actually one of the most secure cloud storage sites (the only other site that I know of that offers two-step verification, for example, is Google Drive, and that's if you enable it for your whole Google account).
That said, I use pretty much all of the services mentioned here (and then some) other than SkyDrive (haven't gotten around to trying it) and that one from Apple (since I don't own a Mac) for different purposes. Google Drive for documents, Ubuntu One for Ubuntu Software Center synchronization, Dropbox for Windows/Mac integration, Box for everything else. They're all great services.