Register on Binance. KuCoin is known as "The People's Exchange" for its extensive altcoin selection.
Fees: Same base rates (0.1%). Binance BNB discount slightly better than KuCoin KCS discount. Tokens: KuCoin 800+ vs Binance 400+ — KuCoin has more altcoins but higher risk. KYC: Binance requires it; KuCoin is more flexible (basic features without KYC). Security: Binance stronger. KuCoin had a $280M hack in 2020 (mostly recovered). Special feature: KCS holders earn daily dividend from platform fees — unique to KuCoin. Liquidity: Binance dominant.
Verdict: Binance for main platform. KuCoin for altcoin exploration and KCS dividends.