The Short Answer
There is no single best god in Age of Mythology — the answer depends on your playstyle. Zeus dominates economy and late-game, Ra excels at monument rushes, Odin powers infantry aggression, and Oranos offers the strongest Atlantean tempo.
Best Greek Major God
Zeus is the most versatile Greek major god. His Hoplite bonus damage, Olympic Parentage hero upgrade, and Jason hero make him dominant in 1v1 ranked. Poseidon suits naval maps and cavalry play. Hades is the defensive boom choice with shade generation.
Best Egyptian Major God
Ra is the standard pick for Egyptian players — free monument upgrades and Camel caravan economy make him the strongest boom god. Isis offers defensive flexibility. Set rewards aggressive early pressure with Sphynx and Feral animals.