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.
Although they were hacked, they soon fixed it. Remarkably, investors did not lose their money, SAFU Fund helped keep investors safe. If this hack occurred in other exchanges, I believe that those exchanges would have collapsed and exit this market.
I agree with you that if you have been hacked, it will certainly be difficult to regain trust, but Binance is different, they make investors trust more and still stand at the number one position in this market. However, you should not use all assets at an exchange because it makes you more at risk and should be kept in your wallet to ensure for you. Of course the final choice is yours and always keep your property in the safest way.