Alibaba. I personally feel that most of the people on Yiwugou are messy, some are cheating and some are bullying newbies. Alibaba is more reliable, but there are also fakes. The prices of the same things vary greatly. You have to rely on yourself to slowly find a good partner. The basic source of goods and prices are still very competitive. What are you doing? You can communicate and learn from each other.

I haven't used Yiwugou, but I think Alibaba is better. One represents the whole country, and the other has limitations.