To be honest I still can't decide to commit with Lemmy or Discord with appropriate servers.
Lemmy with its federation is great but it still lacks of a great app for iOS and specialised large communities. At least for now.
Discord on the other hand is more reactive, the conversation is here and now. It's a plus and a minus at the same time. Depend on the nature of question or the thing you want to share. They trying to have some sort of forum based channels.
Will see.