It's hard to define “the best exchange” because different traders have various requirements. So, I think it's more useful ‌to search for different sources of information regarding one or another exchange and compare them in order to get as complete knowledge as possible. I would like to mention that it's better to refer to trustworthy articles than to user’s feedbacks, 'cause their opinions may be subjective from time to time. But educative sites usually value their reputation and therefore trying to provide users with comprehensive and honest information. For example, at Cryptohoo https://cryptohoo.com/ you can find full descriptions of exchanges including observations of their security measures, interface, fees, trading pairs etc. Still, any of us have certain preferences concerning priority ranking of these factors. So, pay attention at each advice, but decide by yourself.