Advantage #1: A job offer/sponsorship from a US company is not required.  

Advantage #2: Faster processing time. Labor Certification is not required. Reduces the process by approximately​​​​​​​ 1 year.

Advantage #3: United States Citizenship and Immigration Services (USCIS) determines on a discretionary basis your eligibility for a green card based whether you will engage in a proposed endeavor that is determined to be in the US National Interest.