Different Life experiences form different opinions.
Cardinal Sarah grew up and resides in a Country in Africa that is 85% Muslim.
Pope Leo grew up in the USA that is a little over 1% Muslim and spent over 2 decades in Peru which is less than 1% Muslim.
These two men have opposite opinions, which are NOT infallible.
So, to me, it is quite obvious who knows more about living in a Country led by Islamic radicals.