At doing what?

• Both scale the same for insertions (amortised O(1)).
• Both scale the same for fetches (amortised O(1)).
• A fetch should take a little longer with a hash, but I suspect this wouldn't be the deciding factor in most cases.
• You can really only delete from the start and from the end of an array — anything else can be expensive since it requires shifting the elements — but deleting from a hash should be cheap. For tiny hashes or arrays, this shouldn't be significant.
• You can really only insert at the start and the end of an array — anything else can be expensive since it requires shifting the elements — but inserting into a hash should be cheap. For tiny hashes or arrays, this shouldn't be significant.

In short, I doubt you'll notice a difference.

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