Hey! I switched from NA over to EU last December, during the event server.
I'd say Mystel and Killian are the most active, but I'm not sure.
I can't really say anything for the other servers, but Mystel is quite active.
There are plenty of LFGs throughout the day (most in the evening though).
For being P2W I'd say it's a little worse than on NA, but it's not like you cannot play the game if you don't invest anything in it.
Dragons and Phoenixes though, EXPENSIVE!!
For the cosmetics, we have a way different selection directly available on here than on NA.
For example, all the hanbok outfits are directly available in the cash shop, whereas on NA those are in lootboxes etc.
Less lootboxes on EU, but some cosmetics are also locked behind the Wheel of Jackpots, which sucks...
(Also in all honesty, EME is now worse than GF in my opinion...)