Ethereum is not as good for trading comparing to other altcoins because of its crazy movement of transaction fees to which I believe can affect your profit taking as the price changes are too low comparing to fees if there is congestion.
If you keep few ETH in Binance wallet, you can trade it at cheap price. You can withdraw it when you get enough profits. Some people keep their ETH in exchange wallet to avoid high fees in transferring it. And we can trade it anytime instantly. However, never keep too many ETH in an exchange wallet because it is not recommended.
Anyway, do you have a recommended coin for trading?
Besides the factor of high transfer fees, I think ETH is not too bad for trading. The price change looks good, moreover it is still not reaching the new ATH yet. So, it looks quite safe to trade it now.