Which city is best in Australia

There are many great cities in Australia. Which is best depends on what you like. Sydney is known for its beauty with some of Australia's most iconic landmarks such as the Sydney Harbour Bridge and Sydney Opera House. Sydney is also the largest city in Australia. 
Melbourne is knowns for its fun nightlife, culture, and sport, hosting events like the Australian F1 and the Australian Open tennis grand slam. 
Adelaide is known for its food, and wine, and for being a great place to live. And Hobart in Tasmania is surrounded by great food and beautiful surroundings and is increasingly regarded as one of the best places in Australia for families.