Can't compare Skydrive with Dropbox
Dropbox is meant for rapid movement of small files, via a drag-and-drop interface. Like text files, music, and more. SkyDrive is meant more for long-term storage of many things, such as office documents, team projects and more. Comparing them is apples-and-oranges. Yeah there's some citrus in both, and are both fruits, but they ultimately are different things.