what is the best ex -jnb routing while maximizing miles and comfort?

there are either 4 or 5 segments intercontinental depending on the backtracking.
4 nice segments in asia is easy. 4 nice segments in europe is possible if i can fly back and forth from doha.

it is left with 3 or 4 segments in usa (assuming i do north america asia europe and south africa). only 1 flight is nice.

what do u think?