I laugh at people who think Umbreon combats fighters with Psychic. Yeah, maybe ingame it can, but not in a real battle. Its special attack is very low.
Anyways, I hate 'em both. One, I dislike Eevee and its neo eeveelutions (the kanto ones are all right), two, they're overrated and everywhere in fiction and art (especially Umbreon), and three is that I dislike them in battling... Umbreon is too defensive and slow and Espeon is too limited.
Oh yeah, and Umbreon can't learn many elemental attacks. Like the other eons, it's very limited.