south asia, simply because they have better resources in almost all aspects. In terms of players, I'd say oceania is more better than south asia. However, in terms of market, obviously south asia wins. especially when adapting to the meta.
Had it been CS i would have said oceania easily, but I dont think a comparision is possible till both regions play with each other. Valorant players in SA (India) now have good salaries + good infrastructure + a better competitive environment to perform well.