I'm late but Discord is international, more popular with the younger generation, and more organized in my opinion. It's not just for gamers, Adafruit has one with thousands of members. Discord breaks up the chat into multiple channels, so for example there could be a #beginners,#test equitment, etc. Unless there's some other other reason I'm missing some feature with the former (I know almost nothing about IRC), I think Discord would be a superior option, especially since the community is forced to move anyway.