Hi Jack
eBird is in some ways more user friendly but Birdata is the national bird database and entering bird survey data conforming with birdata methodologies is the scientific way to go. The data can then be used in a variety of ways by Birdlife Australia (our national birding organisaation) for research i.e. compilation of the State of Australia’s Birds and the Atlas program (see Atlas and Birdata on the Birdlife.org.au webpage).
Cheers
Mike
