Espeon
While Umbreon is a better Pokemon competitively (by a narrow margin, but still), ingame teams need a fast and strong attacker to quickly finish battles, a field Espeon excels in, whereas Umbreon is quite lackluster.
Umbreon is more for stall type of defensive playing, which is not suited, or rather, not required for the game.
A good Espeon moveset generally has Psychic, Shadow Ball, Signal Beam and one other filler, the first two being almost mandatory.