Sum of their batting and bowling average are nearly same in both combination.
If today you have to pick an Australian team , which combination will you preferWell you dont want two all rounders. Unless you dont have 3 fast bowlers better than Cairns (i assume here that Kapil is the superior all rounder), Kapil + Cairns doesnt make much sense. I mean id take one with Kallis anyway because you can build a batting line up around him.
Anyway the rest of the line up is also very important. For an example if you are the mid/late 00s Sri Lanka with Dilshan, Sangakkara, Mahela, SummerV, mathews etc plus no fast bowlers, id go for the first option
Well Green is unproven as a test player despite all the potential and i personally prefer Neser or Pattinson over Starc these days anyway so its the second option where id take Kapil as a genuine bowling option. Put Cummins there over Starc and then it gets interestingIf today you have to pick an Australian team , which combination will you prefer
Starc + Green or Kapil + Cairns.