Consular processing vs AOS

USA H1B Visa
1

Hi,

Would someone explain the difference between consular processing vs Adjustment of status? What is the applicability, pros and cons of each? My H1 extension (after I140 approval) has a RFE and wonder why employer is suggesting consular processing option.

2

Adjustment of status is when I-485 is being applied. This doesn’t apply to H-1 extension.

Consular processing is when appearing in-person at a consulate for an interview - visa or green card.

What’s the reason for RFE?