I use only bittrex and binance. Tried this one previously but I am glad that give up soon after registration.
Cryptopia wasn't recognize as scam exchange until they prove it to their customers and to the world at large. According to some speculations Cryptopia exchange is the most scammed exchange as of now.
Bittrex also is not a reliable exchange and for your information they have proven not reliable which poss many questions unanswered regarding the exchange.