i just trade altcoin and for me poloniex, bittrex, c-cex, yobit is the best place to trading altcoin.
now im trade at c-cex and buying some $fch (fastcash) at 2500sat, hope price back to 7000sat
I mainly trade at poloniex, bittrex. They are both good. Some coins are having higher volume in one of the two exchanges.
that's true if you can do some arb you can earn just to be focus with the price diff that's what i'm always doing from those two big exchange waiting for my chance to buy and sell from both of them. good luck