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The stack is cheaper, but it is a limited size. If you need more objects than would fit on the stack, pooling might be a better choice.

The stack doesn't have to be limited. On a 64-bit system, you can give each thread a couple of terabytes of stack space with no problem.

For amd64 on linux you only have 128TB; with green threads I regularly use a lot more than 64 threads.