adjustable array vs hash-table

I could use a hash-table or an adjustable array. Considering the keys
of the hash-table are equal to indices in the array 0.1.2.3.4...
functionality is the same. So which one is more efficient at
a. Expanding when new elements are added when container can't hold
them
b. Accessing elements via index / key.

thanks
Slobodan
.

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