I learnt Chinese as my first language and was really good in it,
but I gradually became more proficient in English than in Chinese.
So I guess it really depends on the individual.
As for TS's question, I believe that balance between the systems
of western and eastern countries is very important. Either on its
own cannot produce good results in young people, due to various
influences. It's really your choice.
For me it's a bit weird la. I learnt English first, then tamil,
then german, then hokkien, now dont know what's next.