There are many (100+) Cryptocurrency Exchanges / Markets right now, Bitfinex, coinone, Bithumb, Bittrex, Poloniex, Kraken, HitBTC, Coinbase GDAX, Bitstamp are few of them. So what is your favorite and the reasons for that?
CEX.io - Modern, lot of options, quickly, never failed, increased rate, which reduces the costs of fees.