I agree too that volumes (liquidity) are extremely important when it comes to trading.
But what I like in KuCoin that they list many new potentially good projects almost on a daily basis. Also not to forget daily dividends, if you own substantial amount of KuCoin shares, this would give a nice additional coins into the wallet every day, and the chances that few of 300 coins listed on exchange prices will go to the moon: are high.
So not only active trading there, but also getting something every day, really counts in the longer run.