Google Drive is a new initiative but as it stands it offers no real reason for anyone to shift from their current cloud drive alternative. Google will have to make some changes to their policies as well as the service itself to be competitive. Time will tell.
I didn't know the Android version of Dropbox didn't function quite like the desktop version. I'll have to test out the iOS version on my iPad to see if it's the same.
So far SkyDrive seems to be the most appropriate option for me, what with my Windows Phone. I'm actually surprised there's no Dropbox app for it yet, though many apps (e.g. Comic book readers) use Dropbox to connect and download your PDFs etc.