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Are you talking about blockchain.info ? I don't suggest it... instead it is better greenAddress.it (multiSig + 2FA+ istant confirm). What do you want more? However also electrum it is a good desktop wallet.
Isn't greenaddress in the end just like another on-line wallet? I don't know much about it. Does the user gets his private keys? How is it more secured than blockchain?
It's really just your preference, however, greenaddress does offer better security and features. Greenaddress allows you to setup a transaction limit and will limit your transaction volume. If your account gets hacked, the hacker will not be able to make more transaction than what you specified. Also, blockchain.info has some security holes before.
Yes, it is 100 time more secure than blockchain.info - check the greenAddress official thread here in the forum :