Due to how email moves around the internet I would never call email or email clients "secure."
http://news.cnet.com/8301-13578_3-57552225-38/senate-bill-rewrite-lets-feds-read-your-e-mail-without-warrants/
If you want security, it would never be sent via email.
Bob
is one preferred or better than the other ,more secure ?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic