Career in Building Surveyor or Registered Builder

Hi,

I am doing final year apprentice in Carpentry in Victoria. I want to go further in building. I want to be a Builder and Building surveyor both, but I am confused. ?

1. Which is better building surveyor or builder. ?
2. In terms of responsibility, who is more responsible for example defects in house after the construction. ?
3. Who can earn more builder or surveyor ?
4. Why there is less building surveyors in compared to Registered builders in Victoria.
5. Should I start Part-time course in building surveying for 4 years and continue in building as a site supervisor, once I have Domestic Builder-unlimited (DB-U), then move to building surveying or Should I start Building surveying full time, take my Building surveyor or Building inspector license, then come back to builder construction as a site supervisor and apply for DB-U.
5. Which way is easy?

Sorry for asking too much.

Thanks