or do you have any "exchange coin" suggestion that better on i mentioned above?
asking this since i actually don't have much time to do a daily trade
Both are good options I think, it will come to personal preference. For me personally, Binance is the biggest exchange with maximum coins and trading pairs availability. So I bet more on BNB. Kucoin is also not much behind of his counterpart, and lately doing some good development regarding the daily volume and number of trades. Also added quite good incentive to people through various competitions. I think you can safely go with 50-50 or 60-40 ratio to BNB-KCS. Both are safe play in longer run.