I've played Atamara, East Continent, Beluaterra, colonies and Dwilight.
Didn't play for too long on EC or BT but the colonies was actually a lot of fun and a far different pace. Really good roleplayers there and the story of the game felt cohesive. I love Atamara, everyone who complains that you can't intrigue or it's gridlocked or blah blah blah forgets that you can't just jump in and start playing whatever you want, there's an extremely long history to Atamara. In the past the roleplaying was better, but nowadays its kinda stale... overall though Atamara has been really fun to play.
Dwilight is my least favourite. It started off great, Everguard got destroyed, I got bummed out, but I didn't rage quit and I played out my character. Nothing. Has happened. At all. SA spreading? Neat. It's completely detrimental to the flow in Dwilight. You can't do anything because you're either of the same faith or someone will contrive a reason to bring down the might of the theocracies on you. There was a lot of potential for Dwilight but it has flopped. I am amazed that theocracies don't fight each other, medieval nobles were always striving for more power and to secure a greater legacy but apparently everyone on Dwilight wants to have a tea party instead of roleplaying medieval nobility.
Dwilight feels like a tea party where we praise the stars and bow curtly to each other. The moment you try to drink your sugar with coffee and cream you're told that's inappropriate and forced to get a black tea instead. And the problem is it has attracted everyone in the game who wants to play tea party, the nonspeakers who don't do anything won't change the status quo, and everyone else is far too content to say "greetings and salutations brother!"
Medieval nobles were only concerned with gaining more power. Anyone who was stagnant found their wine poisoned and titles stolen.