You'll have enough traction issues with a centrifigul, install a roots and you will have instant boost and instant loss of traction. My experience in the past has me leaning towards the centrifugal mated with an engine that already makes good low end torque for it's linear power and a roots for an engine that does not have much low end torque and requires high revs to get moving.
Without traction on the street or strip you get:
