As a general rule, cryptocurrency holders are advised not to leave their crypto on any exchange, and the same applies for Binance. This is because the exchange controls the private keys to your cryptocurrency, and you have to trust that they will keep it safe – one of the main benefits of cryptocurrency is the ability to manage your private keys yourself.
However, if you are only dealing with small amounts of cryptocurrency and you are trading actively, it can be practical to have some crypto on Binance so that you can make trades without waiting for your deposit to clear.
For maximum safety, you should store your cryptocurrency with the help of a hardware cryptocurrency wallet.