Casual C's get alot of the regional flying.
Lots of BOM, PVG, PEK, SIN etc...
They usually have about 4slots on the asian flights and up to 8 slots on the BOM flights. They are usually long trips (6days) so lots of overnights.
The B contracts just seem to get the MEL returns.
Not sure what type of flying your after but you can be assured of being away quite abit.