I do not use a new exchange because of security issue. Can be hacked or simply they can scam. Most of the time, I use Binance and in case, I use Kucoin for some coins which are not listed in Binance. Kucoin is also good exchange. Easy to use. Fast confirmation. Fast withdrawal, almost within minutes. And fast communication.
I agree with you. Binance and Kucoin are good and fast. Every exchange starts as a new exchange. There should be some good exchanges in their earlier stage.