Probably SBS want Scania becasue the EGR approach adopted
by Scania need not to use Adblue.
Comfort Delgro should get a very good deal from Scania, they not just order 500 Scania for SBS, they also have order 200 Scania for Hillsbus and Westbus in Sydney, all with Volgren CR228L body
I have driven Hillsbus Scania K94UB and L94UB, they are not that great in terms of power, even approaching a small slope they can get very sluggish.
To ensure those buses are covered under warranty by Scania, drivers from ComfortDelgro Cabcharge (aka CDC) are instructed not to use kickdown and always keep the bus running in the green zone, and if any drivers get find out that they use kickdown constantly from the bus computer, they will get into trouble.
I think the benefit of getting them is, they are significantly cheaper compare to a Volvo/Merc, both maintenance and operational wise.