It depends on if you want show quality or not. I would say silkies would probably hatch the most chicks, and if they don't have to be perfect are common.
Silkies are generally considered to be the best broodies, but that means lay a clutch, sit for 21 days, raise the chicks, repeat...:) I that's what you want they're great! Cochin bantams are also popular, and Japanese's are *supposed* to be good broodies, though mine never has.