One isn't necessarily more correct than the other. "Aboriginal people" and "indigenous people" are synonyms that have almost identical denotations. However, the connotations are a bit different. Like Seth said, the term "aborigine" is heavily associated with the original inhabitants of Australia, but it can also be used to refer to any indigenous people of a region.However, "indigenous" is probably safer. The term "aborigine" was more heavily used during the era of European imperialism, so it become associated with the mindset of that time. Recently, as Westerners become more aware of colonial history, old words from that era have been replaced to show respect towards those affected. Using these newer words is considered "politically correct", and political correctness has become a key issue of modern Western culture.