For my own reply, I think I'd evolve into Umbreon. Mainly because it looks the best in my opinion, and it would be perfect to show off in gyms as a tanky defender that gets nuked by Machamp. I'd have a hard time evolving into Espeon since it's not an optimal raid counter for anyone other than Machamp.
If I had a shiny Eevee, I would evolve it into..?
Say that shiny Eevee was theoretically added to Pokémon Go and they're super rare - and you managed to catch one. It's IVs and levels are plausible, but not ideal. You've used up all of your name evolution tricks. Do you keep it the same and not evolve it? Roll the dice and take a random evolution, even though it's not meta? Or do you walk it and evolve into Umbreon, so it becomes the best looking (but also worst for attacking)? Or evolve into Espeon, so it's usable but hideous? Let me know!
Answers
There are some that seem to go well with green. Such as:
Machamp. Hulk smash! https://media-cerulean.cursecdn.com/attachments/thumbnails/16/423/530/530/mark-mcquillan-machamp.jpg
or Scizor, who looks like a mantis https://i.redd.it/usajr7bdxway.jpg
or Tangela https://i.ytimg.com/vi/7Wx00UgjQyI/maxresdefault.jpg