Both have their ups and downs:

Western guys:
They don't have as much pressure to get married so they can move out of their parents' house and they're not obsessed with finding an innocent virgin 10 years younger than them ;p But this also makes them less likely to stick around since the point of the relationship isn't marriage but just enjoying life for the moment.

Chinese guys:
The traditional Chinese guy have a bigger sense of responsibility to their girlfriends and are usually in it for the long haul. But a lot of them aren't as experienced which can make it awkward at the beginning, especially for Western girl with different ideas about relationships.

Depends on what you are looking for.

Romance and love or duty and responsibility.

Explore the unknown, said the wise. Only by mastering the ways of the locals shall you find the true path to happiness