"Poloniex", "Exmo", "Bittrex", which is the most trusted exchange office?
Better to choose bittrex and poloniex since they have the reputation that deliver some good trading service here and exmo is unknown site where we can't trust for. But make bittrex as priority right now since poloniex has several issue but I believe this problem said well be elimated by them and be fix since they doesn't want to ruin their business reputation.