Indigenous - A globally recognized term that recognizes original inhabitants who have been subjected to colonialism. It is the word used by the United Nations, and its use has been growing in recent years.
Aboriginal - Also a broad term to describe original peoples. In Canada, it is often used when referring in general to First Nations, Inuit and Métis people - although ‘Indigenous’ is becoming the term preferred by many.
Always ask people how they want to be identified. Most like to be identified by their specific First Nation rather than a blanket term.