BX has the most volume and users and is for the most part reliable as an exchange. I have had some issues with them before, though. Specifically you are at the mercy of their verification processes when you deposit money, you have to go through multiple steps including attaching a fully detailed bank slip complete with time, date and full account details (name and full acc num) of sender and receiver, which some local banks do not include on their receipts due to privacy policies. If you fail to provide such a transaction receipt according to their requirements, it can cause delays a few days. For some of the local banks to get such a fully detailed slip you would need to spend up to seven days, of course quick shortcut would be nice to take a screenshot on your screen with full details if possible. wow it is better to have more caution than less, In trading, time is of the essence and if a central fiet bank is able to provide transaction reference number for an instant transfer yet the deposit is declined claiming that the system was not able to find the deposit in their bank account, despite having official full transaction reference number provided by the bank then it is a clear indication that the verification system is flawed.there's no reason why a crypto exchange should have delays that take 1, 2 or 3 days or longer to verify a deposit and then cite reasons for stringent verification procedures, which is really not necessary in 2019 and causes multiple headaches for all parties involved including the need to open up tickets to resolve the problem. In my particular case I was expecting an instant transfer which was made by the bank, but due to such hold up I was not able to get in on a very lucrative trade and by the time my deposit was finally confirmed by The Exchange the price has gone up far too much to be lucrative anymore.