Hello Tonelir,
In regards to learning Chinese, either China or Taiwan would do the same job. You should consider your circumstances and choose the country that best suits your needs.
In both China and Taiwan there are a lot of factories and wholesalers looking for people like you to export their products.
After mandarin, cantonese would be the next best dialect to learn. In Taiwan, they all speak Mandarin and Taiwanese. Taiwanese is also called Minnanhua and is used also in China. You'll probably find there are more people speaking Taiwanese in mainland China than there are in Taiwan.
Checkout
www.dropshiponauction.com for wholesale prices on a range of products. If planning to export from Taiwan, you can contact Herman du Plessis in Taiwan. He is a South African living in Taipei heading Wise Enterprise Co. Ltd. His email address is
herman.dup@msa.hinet.net
There is also Alibaba which is worth checking out.
All the best!