回复：新手上路-申请哪种类型的绿卡比较有利

As I know, postdoc is not a qualified permenant position defined by CIS. LC is not feasible unless you can change it to a permenant title. NIW/EB1A is postdocs' only choices.

Compared to LC, NIW is riskier. It depends on not only your qualification but your luck.