A good crypto exchange is an old exchange. The second is the ability to trade not only in long, but also in short. Accordingly, the number of exchanges is sharply reduced. And the third for me is the huge volatility. What it is, the better.
Binance is not too old exchange but it is the best of other now.
You are the one deciding when to trade so exchanges is not based on trading time.
Huge volatility depends on the people who are trading it,so you are completely off from how to pick the right exchange.