Yes, both the Apple and the Droid would be more secure. Of course I would never buy Apple as "I" am capable of changing my own battery and you can't read it as a mass storage device. And in my opinion - only a fool would run Droid giving Google more info then they already know about you. But yes, both are better than the BIS.
Just do some searching, "iPhone Yahoo SSl ports through email client."
Just basic searching, shows they ALL have the ability the BIS does not give you..