Best country in Asia or SEA for ethnically Chinese kids to grow up?

I don't have kids yet, but I like to plan ahead so I'm doing research before I become a parent. I am Chinese-Australian and will be a single mother by choice (using IVF). I am planning to become a teacher so I can get a job at an international school. I am looking at relocating to either southern China (looking at Shenzhen/Guangzhou) or Malaysia in the future (next ~5 years). I haven't considered other countries in SEA but am open to suggestions.

I prefer to settle down somewhere with both an English-speaking expat community and a Chinese community. Please let me know if you think any of the above places I mentioned would be a good place to raise kids, or if you have any other recommendations. I would like my kids to grow up bilingual in English and Chinese (Mandarin).

Thank you.