In stock form, the SR makes better low RPM torque but the CA revs higher than the SR.
Just think RB and you’re gonna get in line with what the CA does. CA revs HIGH but can be a pussy low down.
SR has 0.2L more for low down torque. Probably not the best factor, but one of them for sure.
BTW, I am in no way an SR or CA guru. Just mentioning what I’ve heard and what I’ve read in the past.