Question What is the best powerline adapter?

[tablespoon]

Hello, security and speed are important. Which powerline adapter do you recommend? I know the netgear one has default key which we could press a button to generate a random one. However, I don't know how such key is generated. For example, if I press the button once to generate a new key and if my neighbor in the same building also did the same, will we end up the same randomly generated key? With such concern, is it better to choose one that could communicate with the adapter from a computer and decide the key myself? Also, is 2G the fastest one available in the market?