Regarding security; all security measures are only as strong as the weakest link in the system and we DO know fairly certainly that for all systems designed to be operated by humans it is always the human part.

Any security measures that are built into devices will be subverted by the users if they require to do that in order to adapt the said devices to their use patterns.

Hence I believe it is out-of-scope to try to compare which systems or devices are "by themselves" more secure; it would be more appropriate to compare which systems could be easily used as secure environment, given a hypotethical user-who-understands-security-concerns...