We know that Bittrex and Poloniex are the most sought after exchangers.
But I want to know which one is best to trade? and I want to know why.
Thanks.

Both are good for trading. But I love bitterx. Because bittrex is friendly. Deposits and withdraw system is easy and fast.But poloniex sometimes under DDOS attack. Poloniex deposits and withdraw system is very slow.They take long time to make a withdraw. But both exchanger good an I trade both exchanger