bch: "Most useful features for me is contacts and photos synchronisation between devices."
I see Microsoft as being one of the best in the cloud storage. There is an unlimited amount of synced data that is not backed up on online servers and that is a huge benefit in my opinion. Microsoft must just promote more their products though, they are one of the best and still, dropbox is far more popular.
On the other hand, Google products are always overhyped. See the Google Wave and Buzz in the past...
I am not a fanboy of Microsoft or against Google, I would wish for people not to judge any company by its comments or by what it claims and just try their services (and i mean for every company sort of...) and then judge with your mind not with the company reputation.
For example, Google Chrome is good now (should have fixed bad security issues) and IMO IE9 is good too. Google focused on developing Chrome more than Microsoft's IE and Chrome is now better. But it is a shame that people deny the good things in IE9. I was impressed by tom's hardware on this metter when they published an unbiased article claiming IE9 was the best at the time (Browser Grand Prix thing).
So, after all, I hope Google Drive will be good and it should also dirve other services like Box, Dropbox and Mesh to improve their free services. (and why is SkyDrive always mentioned and not Mesh?)