Hidden fates shiny vault gx worth it?

Hi there,

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Sorry I've been really liking the shiny vault cards from hiddin fate and recently got an ace 9 lucario. Was hoping to get some more and hold long term. Some of my choices are Darkai, Leafeon, Gardevoir all at PSA 9, or Greninja at PSA 8 and all priced slightly above current market. Which of these would you consider most worth a long term hold? Was leaning a bit more towards leafeon as feel underrated but Darkrai is a very underrated pokemon which I like a lot. Just find it hard to tell if the premium price is worth it.

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Thanks!