If you are interested in waves only then go to coinmarketcap (
https://coinmarketcap.com/currencies/waves/#markets ) and check which place would you like from the list there.
From that list for waves I would recommend bittrex and livecoin.
...Somehow I don't see it would be listed on poloniex on the coinmarketcap list, but it would be my choice number one... even after they removed trollbox
Livecoin is getting more users on their website now that they list coins that recently closed their ICO. If Livecoin actually stays with their current trend then the amount of traders on that website will increase since people are purchasing more ICOs now.
Bleutrade used to be a nice place for Altcoins, I dont really know what happened to them. Its like Bleutrade just went dark and all the people that used them got rich.