Pfizer R&D vs. NIH SIP Summer Internship

Reposted from r/biotech because I want perspectives from both sides.

Hi everyone, I have to decide between a 2026 Summer Internship at Pfizer’s Pearl River R&D location (antibody/vaccines) vs. NIH SIP immunology research. I am currently a sophomore in college and that will be the summer before Junior year. I already accepted the NIH internship since I got that offer a while ago, but I think it’s not too late to turn it down if I choose the other. For career direction, I’ve never tried biotech industry but I have had two years of research experience. I don’t see myself conducting research for a long time, as in academia. I do know NIH might give more mentoring or self-directed project and depth of research, and I don’t know much about the Pfizer internship in terms of format (there are three brief project proposals). I would really appreciate genuine advice on which internship would help me grow more and better for my career!

Logistics don’t matter as much.

Thank you so much.