Tapu Bulu Or Tapu Koko?

Question

Which is better for competitive battles after finishing the main story?

Comments

He wants to know which one would be better after he beats the champion, which one we find "stronger"

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Better for what? Battle tree? Battling with friends?

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Battling with my mates! (Cuz that is what I always do)

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Singles or doubles? Are your friends not allowed to use any Pokemon, moves, or abilities?

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Single battle and any Pokèmon

Answer 1

Both are easily countered by the very common primal Groudon and outclassed by the almost-as-common Xerneas. However, Tapu Koko is slightly more likely to be useful because its speed lets it revenge-kill a few Pokemon and it can use U-turn to reduce the need for you to predict switches.