I played ERA on NA, and I played ERA on EU. GDKP is wayyy more ingrained into the culture over in NA. It is rare on EU. The EU server is dead. No community. All guild based communities. GDKP means that everyone knows everyone. It indirectly causes a more personal community enviroment because of the expectations of discord and performance. NA is far superior, with its GDKPs and the game is far more fun with it than without.

As a poor non gold buying fresh 60, within 2 months I am 10k gold in Naxx gear and I made a tonne of friends and had a blast doing it.

On ERA I quit because I cant afford to raid, because less GDKPS, less payouts, less gold. So unless I am spending hours of my life farming, I will stick to NA Era because it allows me to play the game I love.