Difference between Guangzhou and Shenzhen?

It's simple economics, close to Hong Kong, new young urban area with a ton of money being invested by the government and the public sectors. I also considered Guangzhou yet was not cool with the air as well as the water pollution. Shenzhen will exceed New York city's importance in the world economy in the next decade. I personally want to be in the fastest growing city in the world. Key location for starting a import/export business. It is located in the economic zone therefore is exempt from a lot of outrageous taxes the Chinese government require from other cities throughout China. Shenzhen is the money city, why do you think all these people flock to this city, because it's wonderful, no because it's where the most opportunity is. Being at the right place at the right time is how you succeed in life. I plan on staying in Shenzhen another 3-5 yrs to get the business started and then just travel back and forth from the states. Economy is hard in the states so I'm here to change the direction of my future. You live here you will have opportunities you would never have in your home countries.