Why does Tapu Fini outspeed Tapu Bulu?

Question

is it because of the boat fini wears?

Answer 1

Tapu Fini is based on Swordfish.

And Tapu Bulu is based on Bull.
Swordfish's average speed is 40 mile per hour.
It is the 14th fastest animal.

And a bull's average speed is 25 mile per hour, if i'm right.

Or,

GameFreak Logic.
Correct me if i'm wrong.