It depends on your use-case which one is faster

• If you want to loop through all elements, arrays are faster
• If you want to look up a specific element (where you know the index), arrays are faster
• If you want to know if a specific element is in a list, hashes are much faster

There are many posts on this, e.g. the discussion in this thread Why are hashes so much faster?, or the mailing-list entry here.

HTH, Rata