iOS exploits are cheaper than Android exploits because they are so plentiful. Plenty of apps on iOS have been caught activating the camera or snooping on the clipboard on iPhones.
iOS seems to be more privacy oriented (for the western market, where the government does not yet have the power to force them to comply) by default, while android needs more work put in. If you did as much as you could to secure both I'd agree with you that android is more secure.
