Homo erectus represents a significant transformation from previous hominins, like the Australopiths, to a species much more similar to modern humans. Homo erected were considered more advanced because :- Homo erectus had a larger brain size.  They were tool makers and they used tools for hunting. Relative to their Australopith forebears, Homo erectus was bigger, smarter, and more able to occupy and survive in differing landscapes in a changing world.