The reason I give Zndrsplt the edge over Okaun is the added value you get from its ability
From the pack art we can see shiny versions coming of: Ditto (yet unannounced card), Boltund, Centiskorch, Lapras, Dragapult, Toxtricity and Charizard
Were running persist creatures, like Kitchen Finks and Grazing Kelpie, alongside weird old cards, like Aboroth and Lichenthrope, and Amonkhet block all-stars, like Crocodile of the Crossing, to ensure we have plenty of -1/-1 counters
microSD card
All phases are skipped down to the cleanup step
If you're impatient, you can also counter-removal cards like Aether Snap to remove them completely, or counter-moving cards like Tidus, Yuna's Guardian or Nesting Grounds to manipulate them to make it your opponent's problem