When it came to a very system-deep A320 for X-Plane, for a long time it was almost a question of faith: Flight Factor or ToLiss? Because both developers had each brought their own implementation onto the market.
This should now be a thing of the past for the time being. According to this post on the official X-Plane Facebook page, the two developers are now apparently joining forces. And are developing an A350 for X-Plane 12.