Eeveelutions

[The name master]

Which would one you have out of these groups?

Eevee, Vaporeon, Jolteon, Flareon

Espeon, Umbreon

Leafeon, Glaceon, Sylveon

Choose one from each group!

My list:

Flareon
Can't decide between Espeon and Umbreon (maybe Umbreon)
Glaceon

[MonsterMon64]

If I had to pick just one from the first group, probably Jolteon, but then I like all three of the first Eeveelutions for different reasons.

Espeon, hands down. I like its shiny, besides.

I always wanted to give Glaceon a proper try, but other than one or two I tried raising, never really got far with it.

More Eeveelutions seem inevitable, and it make sense flavor-wise for Eevee, but I do wish Game Freak would give other old Pokemon split evos to choose from. Not as MANY per 'mon as Eevee, though. That'd be silly...?

[Captain Jigglypuff]

Group A I'd choose Eevee only so I can breed and get more Eevee to evolve into the first Gen Eevelutions

Group B I pick Umbreon because I've always liked its design.

Group C I choose Sylveon because it is much easier to obtain than the other two and I can evolve Eevee into one literally anywhere that won't activate the evolving process to get Leafeon or Glaceon.

[Johtoliyder]

Eevee
Espeon
Sylveon

would give you the potential BIS for those groups and flexibility

[MegaNerd14]

Jolteon, Espeon, and Leafeon.  Those are the best ones period.

[Petzbreeder]

I like Sylveon, because it looks so different from the other Eeveelutions.