The best Eevee evolution in Pokémon Go is a matter of personal preference and the specific use case. However, based on various rankings and player opinions, Umbreon and Sylveon are often considered the top choices. Umbreon is highly regarded for its performance in PvP, particularly in the Great League and Ultra League
. On the other hand, Sylveon is praised for its strength in battles and its Fairy type, which allows it to perform well against certain Pokémon
. Ultimately, the best evolution depends on your own priorities and the specific role you want the Eeveelution to fulfill in your Pokémon Go gameplay.