poloniex has a very good and understandable interface, I like that it has stop loss and you can leave orders to buy and sell when you want, what I do not like is that it does not have many cheap coins, since some of us do scalping with cheap coins because that we have little capital, we need cheap coins, far from that I like that they verify you very fast, the support is good and they help you whenever you need it
from 1 to 10 I give an 8