In Australia, Junior and Senior Schools takes a total of 12 years and duration for a bachelor degree is usually 3 years. So students in Australia will graduate one year earlier than students in Hong Kong, which is an edge to the students.
Living expenses in Australia are relatively low comparing to some English speaking countries.
The time difference between Australia and Hong Kong is small. In winter time, the difference is at most 3 hours. Students can easily communicate and catch up with family and friends in Hong Kong.