Depending on your NBN Technology available, Starlink can offer you a faster and much more reliable internet service.
Starlink offers a reliable internet service because the Satellites are within lower orbit and there are more satellites compared to the NBN.
For example, the NBN Satellites are higher in orbit which means a longer distance for data transmissions to travel resulting in a longer response time (also known as latency). Also, there are fewer NBN Satellites which results in slower internet as every other user has to use the same bandwidth provided.