Kucoin without a doubt, they are small but they have good volume, good promotions, their shares, on kucoin all the time you have something new, and they are sending all those announcements to mail, sharing on different social networks. I think they are aiming to be big one day, much bigger then they are now. You can trade without kyc, just with withdraw limit, which is benefit for me.
Kucoin is also my favorite exchange because the trading volume of this exchange is real and has been chosen by many small investors in recent months. I think Kucoin has a very good level of security because every time I withdraw money I have to go through 3 security processes and this makes my property safe. In the future Kucoin will grow even more if the IEO projects at this exchange have great success and this exchange has many new investors, the Kucoin will soon become a big exchange in the future.