When choosing an exchanger, please firstly pay attention on its having an additional check and official registration. When making transactions, remember that in many payment systems they are non-refundable.
When choosing a specific option for exchanging cryptocurrency, one should take into account the size of the commission, processing speed, comfort of work and other important characteristics. Personally, I prefer to make an exchange on the exchange, where I have been trading for a long time using the forex broker AvaTrade. Conveniently, algorithmic automated trading is possible on AvaTrade, as well as social trading and copying of trades.