I have no idea WHY ZEN is not on Binance exchange.  I sure wish it was.  That's where I do the majority of my trading.  That's where I prefer to do all my trading.  I believe Cryptopia Exchange is a better platform than Bittrex.  I at least like the way it looks better than Bittrex.  I haven't traded on Bittrex for a while because it was very buggy the last time I was there about 6 months ago.  I simply got tired of the bugs and stopped trading on Bittrex.  Maybe it's better now.  I have no idea.