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The first Eeveelution I used on a team was Vaporeon. I had fun using it because of its high HP and decent level up moves (in FireRed's case). As for my favorite: Jolteon. It's fast, hits hard and looks cool overall.
Jolteon for his speed and special attack. He's typically the Electric type on my team if he's available early on, and he's on the team I use for battling others.
I always want to evolve it into Umbreon, since Dark Pokémon is my favorite type and it looks cool. However, when Umbreon was not available in the first generation, I used to evolve my Eevee into a Jolteon, because I didn't bother catching an electric type Pokémon.
I like all of them, but Umbreon is my overall favorite. As far as teams go, even then I still prefer to use Umbreon. It's usually my tank on GSC/HGSS. =w= But I still use other Eeveelutions as well. Cannot deny the fluffy cuteness.