I have no option other than to lay down my intellectual tools before you and declare you the winner of this battle of the ages. I am humbled by my idiocy in even bringing up the fundamental economic engine of the early American republic, as if it actually mattered at all in the face of the noble, if perhaps a little selfish, goals of those proud young Americans.
I'd also note slavery was also influenced by how land distribution happened in the colonial era. Lands dispersed under more feudal models lent themselves more to slavery and indentured servitude. Lands that for various reasons that were rapidly sold were more likely to end in the hands of small holders without slaves or fewer slaves.