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.

I use both of them because it would be very profitable if at one of the high prices we can benefit even though not many, which is important profit, and I am also a bounty hunter, so I often also use etherdelta and hitbtc to exchange my coins