One of my basis for choosing a trading site, is it must be trustworthy to make sure they wont run with my funds. So i do some background research if the exchange has twitter if the founder exist, good reviews and smooth and not laggy experience and it has good customer service. Because most of the exchanges right now, doesn't really care about their customers well being.

Also here's my recommendation: Bybit and Phemex i think they're the best ones out there.