Pros and cons for different places to stay

China:

Pro:
Mediocre career path (IT sector).
Good housing and good food.
Close to home.

Con:
Chinese lifestyle.
Not so much freedom.
Chinese mindset everywhere.
Dictatorship. A lot of politics, censorship and restrictions.
Potential bad life quality due to pollution and unsafe food.
Isolated from the world.
Too entertaining. Hardly anyone is serious about anything.

Conclusion: OK to visit for short-term but may not be suitable to stay in the long-term.

US:

Pro:
Good career path (research).
High tech.
Good life quality.
Freedom.
Vast personal space.
Western style and mindset.

Con:
Few connections.
Far from home.
Not so good food.

Conclusion: the learning curve is high but good to stay in the long-term.

HK:

Pro:
Many connections.
Metropolitan lifestyle.
Close to home.
Good food.
Partially western mindset.
Small city. I know everyone. Feel safe.

Con:
Bad career path (if stay in IT sector).
High living cost. Bad housing.
Too materialistic and entertaining.
Crowdy and noisy. Very little personal space.
May easily get bored.

Conclusion: better than China but need sacrifice a lot of things (career interest, life quality). May need to consider other career options.

Conclusions: Both Hong Kong and US look good. But there is a trade-off between short-term benefits and long-term gains.