TransPass are valid on Regional Rail on weekends, so TransPass is the highest level you would need. If you take more than 12 trips (0 or 1 transfers each) per week, the pass is cheaper. If not, PAYG is cheaper. Count RR trips as 2-3 trips for pricing purposes.

If you will take more than 48 trips in the month, go for the monthly pass.

Note that all the passes are Calendar Week or Calendar Month, NOT 7-day/30-day as you would expect.