RSA is fair when comparing their output in their respective home conditions, but I don't think it's fair when you compare Cook's record to Smith's in SA considering the disparency in sample size and attacks faced.On the flipside, Graeme gets the point for being much better in Cook's backyard than Cook was in his, seems just fair to me.
Rabada was a beast right off the gate and Steyn was still a beast, Morkel was also good, It isn't the strongest attack in the world but it's comfortably better than the English attacks that Smith scored 2 consecutive double tons against for example.
Cook's output against non-minnows at home is 45 compared to Smith's 38, on top of Dukes being the equalizing factor between conditions, it's not close about whose better at home.
and a lot of away output gaps are just blatantly contextual, like 2010s West Indies and Bangaldesh being stronger than the ones Smith faced, the home pitches of the 2016 series in particular being horrible with them actually having test class spinners. the legitmate advantages Smith has — UAE Record, New Zealand Record, England Record + performance in Cook's home country, the legitmate advantages Cook has — Sri Lanka record, Australia record, India record + much greater home output. not a run away debate at all.