UW study upends understanding of prehistoric man

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2. Initial conditions are not the same

Hunter gatherers in the Americas had two continents of mega fauna that had not be exposed to human predation. Of course you had a high growth rate. Animals in Africa, Europe, and Asia had been exposed to hominids on evolutionary time scales. That is why so much more mega fauna survived in those continents than in the Americas.

Hunter gatherers in general are healthier in diet. Grain is inexpensive calories but not as good as a varied hunter gatherer diet. So long as the resources can support the approach, I would take hunter gatherer over farming.