Drive or Dropbox?

Pro and con of drive and dropbox?!?

Drive:
- it's product of BigG--->means top quality
-gives u 25 GB, not few considering my hard disk is just 10times more
-...

Dropbox:
-probably much more used
-easy
-just 2GB free, but I'm lucky 'cause my Uni gave me other 10GB
-....