It may not be necessary, if your data is reliable enough that you know there will always be the same number of values in the same order for each key. But I still like the hash-of-hashes because it tends to be easier to remember key names than index numbers. For instance, which of these makes it easier to recognize what it contains?
On the other hand, arrays are faster and use less memory than hashes, so if you're pressed for speed or resources, a hash-of-arrays may be the better solution.
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