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Technically (as far as I know), it doesn't matter.
The second/bottom diagram is just more "tidy". (BTW, I also know of no good reason to number the stack members as shown in your second/bottom diagram, i.e. top unit #2, then #1, #3 and #4. It's contrary to expectations. Might just as well, for just a stack of 4, use the first four prime numbers too. )
