Firm suggestion for a weak case (EB2 NIW)

Hi, I am interested in applying for EB2 NIW. I'm in my PhD 4th year, I have an MS, but I don't have a strong research profile (2 publications and 3 citations).

I evaluated my profile from Chenn and Ellisporter they both are accepting my case.

Chenn: $8000 (or $7400 if paid in full) + 4 letters of recommendations ($600) and refilling until accepted.

Ellis Porter: $6000 (or $5400 if paid in full) and only 1 refile in case of a rejection.

Please guide me with your experience. Thank you.