“Best” crypto trading platform is something subjective.

Best in what? Security(Including History of hacks and security lapses)? Trading and withdrawal fees? User interface? Offers? Trading volumes and liquidity? Privacy oriented or not?

An exchange can’t have it all. So where are your priorities?

For spot trading: https://www.coingecko.com/en/exchanges
For derivatives: https://www.coingecko.com/en/exchanges/derivatives
For Web3: https://www.coingecko.com/en/exchanges/decentralized
For anonymity:  check the list on http://kycnot.me