Why Do Homo Sapiens Leave?

Between 100,000 and 50,000 years ago, Homo sapiens left Africa in search of more space and new habitats to use.On search, some how they met up with the Neanderthals occupying the Middle East and Southern Europe. There’s one hypothesis that suggest that Neanderthals were no match for Homo sapiens. They were, pushed out of their habitats, and extinct by a superior species. Another discovered evidence sets another possibility, that says that Homo sapiens left Africa not in one large, but in smaller movements. This would likely have been easier for resident Neanderthals to get comfortable. The hypothesis suggests that Neanderthals didn't actually leave , but were instead included into the various populations of Homo sapiens. which implies that