For you not to be confuse on which of the exchange are good to trade in in terms of altcoins better for you
to check the top exchange at the coinmarketcap mate, because with this there's no reason for you to get worry about it.
and one of the good platform I could recommend to you are Coinbene, Huobi, Idax, Coinbene and Okex.
You mentionwd coinbene twice, why? Is that exchange better than others until you said it twice?
I trade on ecxx. They are based in Singapore, are fully regulated, use ledger vault cold storage, and are backed by a 44 million dollar investment round.
Here is their ANN
https://bitcointalk.org/index.php?topic=5092500.0But do they really have any volume to complete the trades? because they were here for more than 8 months but still they didn't get into their 2nd page of ANN.
Better to use other known or old trusted exchange rather than risking your money on new exchange which seems unpopular on here