Mufasa - Betrayed Leader has an ability that will help no matter the board state, making him useful in a wider variety of games, as long as you have a character-heavy deck
At the tradeoff of power and the Fleet Footed ability, Tapu Koko instead has free retreat, which makes it a decent pivot but Miraidon ex decks, which is the likely home of Tapu Koko ex, already runs Latias ex for free retreats
As a vehicle, it can stay back while being less vulnerable to interaction, and you can crew it up and attack when you know youll get value out of it and it wont be destroyed
You could do something as simple as adding an extra -1/-1 counter to an enemy creature, or you could really ruin someone's day by doling out poison counters at an alarming rate
Whether this card will continue to climb depends heavily on what future Hunny support is introduced in subsequent sets