Looking for a crypto company that's reliable could be challenging for a crypto investor, given the cryptic nature of cryptocurrencies, but with the proper online tools made available by highly reputed websites like Coinmarketcap and coingecko, one can easily search for exchanges that suits one's need, and not only that, since one's region matters a lot in choosing a cryptocurrency exchange, I'll say you should not forget to search for the best cryto in your region. For example, using Africa as a case study, the leading crytpocurrency exchange in Africa is the Quidax exchange, where the services rendered doesn't only centre on cryptocurrency exchange, but also to help protect users from the bad economic conditions of the country they live in by providing a USD savings feature flr them. That, I deem as an awesome exchange that has the best interest of the customers at heart.
So, consider the option of searching for exchanges that suits you on coinmarketcap and don't forget to look for security features too, how secured are the exchanges you want to sign up on and all.