I honestly wish that if we had a game chat platform, it'd be on NEITHER of those. One of the good things about AIM chats back in the day was that if you knew the chat name, anybody can join. I'm not 100% sold on these 'the chatrooms are invite only' sort of platforms.

course, I doubt the Slack chat'll stick around longer than a week or two (aside from the Vorkosignan cluster who iirc has been using it for a while) so we might just both be complaining for the sake of complaining.