Umbreon and Espeon

I haven't evolved either of the Gen2 Eeveelutions yet. Now that some of you have had a chance to "field test" them, what are the best uses for each? What is the ideal CP/power-up range for each of them? (For example, you don't need to max power an attacker or a prestiger, but you would a defender).

Eevees are pretty common in my area. I've been conserving candy and dust, and like to be frugal with them --especially with the coming rebalance.

At Level 32, I have a lot of Legacy "Swiss Army Knife" and niche pokemon, so there aren't many holes in my gym arsenal. That said, it’s fun to have a variety of good mons, although gyms seem to be loaded with the usual Blissey, Gary, Snorlax, Dragonites, and Vapes, with an occasional Rhydon, Eggy, T-Rex, and Flareon tossed in. (Guilty of that myself.)

Thanks!