Binance is the most popular centralised exchange today. If you want the greatest experience for simply p2p services, I believe Binance is the one to use. If you wish to use it for something else, many people have recommend KuCoin which is also good. It's an excellent platform, and I have a lot of trust in their security system.  Unless you do not want centralised exchanges, you can experiment with the alternative decentralised exchanges mentioned above.