[sAmI]

Yes but I am afraid it is only partially correct.

Not just talking about functional performance and third-party apps, but in overall, in term of the operating system alone, iOS is safer than Android.

Mostly because iOS is far more restrictive than Android. iPhones users are just not allowed to make system changes that may deteriorate the security of the phone.

Here we have two sides of your points. Since iPhones does not allow any system changes that may deteriorate the security. But, Android allows you to do anything literally anything which then now depend on the user of how he wish to share his information and care about the security, iPhones in Pakistan is used as a show-off phones most of the people does not care about anything, They only care about Camera only. 
In functional performance, I'm gonna say iPhone like 11 Pro max is really good, Because i believe the iOS is pretty much optimized for the performance.

A question
In terms of security, What data or stuff you need the most to be secured? Define security in terms for Android and iPhones.