Hello, I want to make a small contribution in case it helps someone.
These are the civilizations most used by players in multiplayer. This after several months of observation. I'm not saying they are the best, but they are the most chosen and used frequently by many players:
RANKING OF MOST USED CIVILIZATIONS IN MULTIPLAYER:
GALOS (+45 players)
SELEÚCIDAS (+24 players)
ROMANOS (+22 players)
MACEDONIOS (+21)
PTOLOMEOS (+21)
PERSAS (+20)
ÍBEROS (+17)
BRITANOS (+17)
MAURYAS (+14)
ESPARTANOS (+10)
Saludos.