Almost every exchange I used shows data and charts about the most traded and most increasing and decreasing currencies in desired time frame. I'm currently using yobit.net for altcoin exchange as it has the largest collection of available cryptocurrencies to trade with.
Well I know Yobit.net is great exchanges site but I saw many people that their coins is disappeared or their accounts have been hacked?
This exchanges site is the best for me Bittrex, Poloniex and C-Cex as you said.