With Training Court, you can loop energy back to hand to give you fuel for other cards
Personally, I quite like it its both cleaner to template, and its okay for white, the colour with the least stack interaction, to have some effects that get to force their way through countermagic, with tools like hexproof or bounce still perfectly valid to protect them
The exact dimensions also help with fake Pokmon card identification because counterfeit cards usually have inconsistent borders, poor cuts, and wrong thickness
(2019-10-04) If either of the target permanents is an illegal target when Oko's last ability resolves, the exchange won't happen
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It can die quite easily to very cheap removal in the format, and it doesn't give you any sort of value up front