Originally Posted by
Viajero
If one is simply out to maximize miles the difference is not that great either way. SWP offers the possibility of a single segment EUR-SWP direct flight, which is great for miles, but SA offers longer intracontinent segments.
Starting from Narita, you can also use the SAO-NRT flight. Personally, I think South America gives longer segments, but I am a big believer in go where you want to go, not where you get the most miles.