If lifetime status is what you after, I would suggest OZ, 500k *A miles. A3's program is too new to *G, no one really reached the 3 year re-qualification point yet, it's still seem too easy to maintain the status with activity. And 20k *G is also too easy, not sure how long it's gonna stay this way...

But since you are in China, if you can tolerate CA, their status is at 1 million km on CA metal, also very generous.