Depend on your purpose:
- For trash coin: Cryptopia, Yo-bit
- General trading: Binance, Bittrex, Poloniex (in descending order). Binance over Bittrex for its low fee and friendliness (easy to verify)
- Decentralized exchange: I don't see any good one yet. Expecting some good projects like Kyber Network, EOSfinex or Neon Exchange.
I like your selection since you are seeing the differences between those exchange, for me I use polo, bittrex and binance as they have good volumes
and the coin really moves so fast, the only thing I don't like with trex is the fee while inside polo the verification to upgrade is taking so long, which why
I mostly use binance as everything that lacks between those two exchange has been improved by this exchange, looking forward that they will continue
to serve like this and more success to come for them.