If you are closer to south side of Sydney, Camden is a good option. It is class D so you get CTA experience but the aerodrome is in the middle of the training area so it minimises transit time and typical taxi/hold times are usually much shorter than Bankstown.
When checking schools, visit and see how comfortable you are with them and perhaps book a TIF (trial instructional flight) to give them a try. One bit of advice I would also give, if a school asks for pre-payment for training or offer fixed price training, be wary.