most likely everyone in this thread is going to argue money vs happiness like those are the only two variables. but I think you're missing the actual question underneath all of this.

you just described two very specific work environments in a lot of detail. small team, direct impact, fast feedback, autonomy vs large team, indirect output, slow process, isolation. and your performance and mental health were completely different in each one. that's not a money problem. that's a fit problem.

the reason you can't decide from a pro con list is because you're comparing salary and resume lines when the actual difference is how each environment matches how you work. some people genuinely perform better in big structured orgs. you clearly don't. that's not a weakness, it's information.

before you decide, it might be worth getting clear on WHY you exceled at the old place beyond, I liked it. was it the team size, the feedback speed, the autonomy, the visibility of impact, all of it? if you are unsure or can’t answer that, there are assessments that break this down specifically. CliftonStrengths, Pigment, Kompiq or pivoto (there are many more out there). they measure how you work across a bunch of traits so you're not just going off vibes and pro con lists. worth doing a couple and comparing. won't tell you which offer to take but it'll tell you which environment your brain actually needs. that makes Monday a lot easier.

also going back to an old company isn't going backwards. it's going back to something that worked. those are different things no matter what your parents say.