For me the top priority to be able to choose Exchange for commerce is security, because crypto is anonymously so when lost it can not be retrieved so the security of the commercial site must be true. good to ensure the safety of the property of investors. Next comes features such as low transaction fees, reputation in the community, good investor support. There are some criteria that I usually choose to trade.
Do you prefer to use one or many exchanges? If many then how many?
my best security is that its great way to choose an exchange because we all know fraud and possibility for the lost crypto when it goes up I should not mention that our wallet is getting compromised. The lowest fee is just fine on the traders day but most of us will really ask for myself that an exchanger gain is just right at the cover of the cost of an operations actually look and combine at zero payout.just let's make my wonder where everyone has gain money to cover their cost .while good and quick response from customer support is also a good way to measure their response for problem solving until now .I think in a few should have the kind of capability to provide a support. 
