This is why I'll choose Dropbox:
"SugarSync transmits files from your machine to the cloud via an SSL-secured connection, but encrypts the files themselves with AES-128 after they reach SugarSync's servers. Dropbox encrypts files with stronger AES-256 before sending them up with a secure SSL connection.
So in the event that someone were to intercept the SSL connection with Dropbox, they'd still have to unencrypt the files. While with SugarSync their job would be done."
So in the event that someone were to intercept the SSL connection with Dropbox, they'd still have to unencrypt the files. While with SugarSync their job would be done."