Plus like someone else already mentioned, having GDrive download hyperlinks is subpar imo. I'd rather get the doc or xls back, edit it on a client, and have it re-upload and convert to gdoc format.
SkyDrive: 25gb (or 7 which is still > 5), cheaper plans, you can access your entire computer from skydrive.com, and it already has iphone/ipad clients.
I really don't see a reason why anyone should use GDrive over SkyDrive unless they were a heavy gdocs user.