Ranked in these QuestionsQuestion Ranking
Pro Puts emphasis on security
SecureCRT has strong data encryption and secure authentication through the support of password and public keys.
Pro Scriptable via Python API
Has a Python API to control most aspects of the terminal and sessions. Scripts can be bound to buttons, menu items, and keyboard shortcuts.
Con Not free
Paid product. Some nice additional Cygwin type features and server version are integrated, but for most users the feature set probably does add enough value for a paid only client.