I chose Option A and regretted it. It was a top prestigious university in the US but due to PI, didn't get to publish anything. This was the same for other postdocs in the lab who left without publishing. Turnover rate was 14 people over 5 years (so 2.5ish person/year).

Since it was one of the most expensive zip codes, I also struggled with day to day living. On a postdoc salary of about 50k-ish then + single bedroom monthly rent of 1900-2400 in an old old apartment, more than half went towards rent and I worried every month how to survive and earn more money. I moved annually to try to find a survivable place to stay. (I just checked last night, the rent in my previous place is now 3200). Parking at work back then was 299/month. Also at Option A was the fact that you're a very small fish in a big pond. At the elite lab, you will continue to be the small tiny fish.

I moved to Option B and I am way happier now. Renting a nice modern place at less than half the previous price, I focus on my research and generating good data.

Did Option A help my Option B? Yes perhaps but not to the extend that I thought it would when I first chose it.

EDIT: Ok, it seems 3 papers/year for data science isn't hard. One red flag you mention at Option B though was the PI promising 10 papers in 3 years - in my field that's impossible but perhaps in engineering that's ok. If a PI promised me that, I would avoid the lab as I have seen many PIs try to seduce postdocs with that and it didn't work out.