There is no inherent difference. It's all memory. That said, as a sibling already pointed out, it's standard to control stack allocation with a single counter.

There is no inherent difference. It's all memory. That said, as a sibling already pointed out, it's standard to control stack allocation with a single counter. It's kind of standard to control heap allocation with an index and a lot of book-keeping. But you are allowed to optimize the heap until there's no difference.