Probably the easiest backup
Dropbox's USP is its ease of use: it's a graphic interface with folder and it keeps everything within backed up. Good app too which allows access while you're out and about. I also like setting up specific sharing folders.
Very easy to use Reasonably priced Good mobile app Very easy to set up sharing folders to exchange documents with others
Security is probably not the strongest
I actually use both but in slightly different ways. Builds up a strong back up policy I have.
I haven't switched - I use both together for a strong, flexible overall solution.
Back up of documents Sharing large documents with others
It has made the secure sharing of large documents much easier
Difficult to say but I feel much more secure with all my documents back up continuously.
It's great for backing up personal documents and business documents which aren't too sensitive. Very easy to use.