From my extensive recent experience as the Seleucid Empire (I've had to manually fight every battle to ensure that my hoplites work right, especially against the Egyptians), I find that the specifics of the Seleucid army are perfectly suited to my battle style. I would say my best command is with hoplites, supported by archers, with some light cavalry and perhaps chariots for support, though I tend to shy away from the chariots, they get spooked by my archers' flaming arrows.