What i can tell you about Odin server is it has probably the higest average level of player skill out of any EU servers.
The market is really bad though.The amount of undercutting is desperate there.It's a hard server to make any gil.On the plus side it also means that alot of prices have been driven into the ground.
I dont think its a very good server for new players either as its too raid focused which means not mcuh time to help newer players.
It also is the undisputed champion for worst hunt community out of every single data centre.None can rival the toxicity that goes on with hunts there.

Moogle server is full of people that dont know how to play their jobs or do mechanics even at lvl 70.They are actually famous for it and the bane of duty finder in the EU.Some might say a lot of them dont even care about playing the game properly.I've heard there is a lot of rp there too.

Zodiark is a very friendly community and extremly active.A lot of new players have come here now so the population has increased dramatically.The market board is qustionable at best.The prices are literally just random in how they change.There is no pattern to it.In the plus side you can get some really great deals there.
I think we have one of the more active Eureka player bases too here.