With a UK passport they are equally possible. If you emigrate to Australia and do not become a citizen you would lose your residency status if you spent a certain continuous time out of the country- I think it is 2 years. There are about 1 million from UK here without citizenship. They have other limitations such as not being able to hold certain jobs- mainly public service. I have had both passports for nearly 30 years and move freely to many places often alternating them to meet visa requirements in different countries.