i dont have anything against binance about being one of the trusted exchanges, but how did you assess bnb to have highest security, where they were hacked last year? though they may have already upgraded their security system, but you dont have any back up of such claim.
As far as I know they were able to freeze the transactions of the hackers and that left them unavailable to get any or atleast just some of the assets hackers trying to steal. If that would had happened in other exchange then hackers would have gotten away with free loots in their hands. It a lesson learned from Binance and they even upgraded their system to tighten up the security.