The best exchanger for centralised one is still binance then Kucoin. The reason i choose both is the exchanger have a lot of feature and a lot of coin/token. Coin and token there also most of them have real project. For decentralised exchange is Uniswap for Ethetem token ( very high fees ). And pancake swap for any token on BNB network. But decentralised exchange could probably listed shit token which has no use case ( DYOR ).