Poloniex is the best trading place so far, they have the better UI and more legitimate coins are listed on the site, therefore you can ensure that coins listed their will not just disappear and will do the pump and dump game.
thats right. if we want to trade altcoin, poloniex is the best a place to trading
there are many altcoin and volume is huge.
The volume of the Etheruem is the largest in Polonex, however, it was surpassed by the Monero in the last few weeks.