If in my opinion throw away Kucoin shares and buy Binance coin, because Binance is better than Kucoin,
especially in terms of future security, obviously Binance is good at that, 7% for KCS is a big amount, be aware of that and you will not regret it
I agree to you that BNB has more development upcoming and chance to survive the ups and downs of market than KCS. I am also more confident to trade in binance because CZ will not let its investors to stay away from Binance. BNB has more utility and its development is quiet crazy. I have invested in BNB since the start of this year because it is my long term hold as well as ETH and BTC. However, it is up to OP of which he think is good to buy and probably will paid of soon as the market have bull runs.