The difference
What each option actually means
One slow basin may indicate a local trap or branch issue; multiple affected fixtures can suggest a larger drain problem.
The trade-offs
Symptoms guide investigation but do not definitively locate the obstruction.
How to decide
Note affected rooms, gurgling, sewage overflow and whether neighbouring properties are affected.
Before choosing
A plumber should assess suitability, condition, access and applicable requirements. Product or repair recommendations made without seeing the property are preliminary. Ask for the proposed scope, exclusions and relevant warranty details before approving the work.
Little Bay Plumbing can discuss the choices with you and help plan the next step for a Sydney property, subject to booking availability.