Well one thing is for sure................
Both underground networks could do with a works train going down them with the water pressure sprayer on to blast off all the grot, grime and dirty dusty crap on the walls and track etc. I last time I saw Sydney's underground was in 2000 and it looked absolutely filthy. Admittedly its much older but never the less, its probably never been washed down since it was built??
Melbourne's stations have metal paneling on the sides, and despite them being only 35ish years old, its looking grotty, disgraceful and unkempt.
Sure, you're just there to catch a train, but when the train isn't there that is the dirty crap you have to look at!!
About time they cleaned em both if you ask me.