Red flag is team is entirely fresh grads on H1B?

Posting as I'm a college student with little knowledge about offers or immigration. I received an offer for a machine learning engineer role at a well-known bank (NYC), TC offered 120k + yearly bonus. One thing that is weird is that the team is all fresh grads (1-2 yoe) from American master's programs, except the team lead (American, and much older). One immediate downside is that there is no experienced technical person working on the team (compared to a big-N team I got an offer from, which has people with 10+ yoe and PhDs). I am trying to figure out any cons of working on a team where everyone is on H1B. One red flag was during the onsite lunch interview, when one employee joked (!) that everyone on the team is H1B so they have no choice but to get along with each other, kind of like how you don't get to choose who your family members are so you just have to tolerate them. (I have a greencard now, but I guess everyone thought I was an international student). Anyways, I guess I am worried that maybe the stress levels are especially high in this team, because the stakes of being fired are higher for H1B visa holders, so everyone works extremely hard. Someone external to the team, but still working at the same bank, told me that this particular team overhired a few years ago, and then cut a lot of people, so a lot of people on the team are stressed, even though their jobs are not directly threatened anymore. Also, wlb in finance tends to be a lot worse than in tech, so maybe the stress level on the team is just normal for the finance industry, and has nothing to do with the fact that everyone is on H1B. Anyone can shed some light on this? Other offer is with chill big-N in Seattle area, TC is approx 110k base/50k sign on/100k stock (don't rmb exact #s)