I've been analysing Coss against KuCoin alot since and before I bought into KuCoin.

Here are the reasons I desicided to choose KuCoin:
- Coss is basicly a dead exchange. Todays volume is 47 BTC that's nothing for an exchange and 75% of the volume is made by their Coss Token. So baisically no volume equals no earnings.
- KuCoin on the other side has a volume of 10700 BTC and it's growing every day.
- Coss is older than KuCoin and KuCoin is still so far ahead.
- KuCoin is listing 1-2 Coins every day and is often the first exchange to list coins after ICO. These coins have a good potential to grow x times per se.
- KuCoin is having amazing promotions like receiving BTC for retwittering one of their Twitter posts, ...
- KuCoin pays the dividende daily so there will be less manipulation by people buying the coin right before the KCS snapshot and dumping it afterwards. Coss payouts are weekly.