[aurbano]

I started in the big corporate company and now work for the exciting startup.

You want to maximise your learning, as long as there isn't a massive salary discrepancy try to have a lengthy chat with your future tech lead and pick the one that seems better - ultimately this is the person you'll be learning from the most in the next few years.

And also, don't be scared to quit or change teams early. Don't stay longer than you have to.