It's like with the sims - we must not always think one-way about competing only - one OR the other.
We live in great times; we can have both.
Yes we can visit both.
But from my personal experience, being a moderator in Slitherine forum, it's good to have just one official forum.
Slitherine and Matrix games in spite of being the same firm, they have two forums, one in Matrix the other in Slitherine.
So for the same game we have always two forums. Jesus! It's a mess sometimes. Besides it's bad to have the community spread in two forums, for all the reasons.