A negative pressure, pan evac system is the best on racers.
The header evac system is better than the pcv but there is a new kid on the block. The new system is a crankcase evac pump
. It bolts on the front of the motor and runs off a pulley. It actually sucks the pressure out of the crank case. This alleviates the ring blow by pressure that acts on the bottom of the piston and increases HP over the header evac system.