neoxian.city by far. Their City (Discord server) is full of very loyal, active citizens. There are a lot of intelligent, goofy and crazy discussions going on at all times of the day, and tons and tons of Giveaways! I ran a giveaway there randomly for SBI units every once in awhile, and boss @neoxian and some other top Dragons host giveaways for 100% upvotes and various other things.
Of course, there are strict rules to follow in the Discord, and in order to qualify for a Giveaway you need to have been an active citizen in the last 24 hours, to level in the ranks and get access to more things like loans etc you need to be an active citizen but it's so worth it!