2 iPhones Are More Secure
Apple’s iOS is a closed system. While that impedes some customizability, it’s just part of what makes the iOS platform incredibly secure. With the exception of a few hardcore hacking tools, it’s incredibly difficult to break the encryption on an iPhone.
There are also a lot fewer vulnerabilities discovered in iOS than Android, at least in recent years. If you care about data privacy or data security, it’s also hard to argue with a company that went toe-to-toe with the FBI. Apple did just that because it refused to create a vulnerability for its devices.