Binance is the most popular. But it's not the best, IMHO.
As for me, I'm using exchange services (usually changenow or any other similar) to swap or buy crypto.
Binance really has great popularity, but I also prefer services without registration, for example, this one. It is much easier, in addition, there are many references to the fact that Binance can block an account, therefore, you can lose your funds.
I prefer Binance, but this is really risky since there is no guarantee that they will not block your funds. Indeed, as described above, using exchangers without registration looks more secure.