I don't know that startup vs. big matters as much as small vs. big. If you can work for a profitable small company where you matter and you wear many many hats

I don't know that startup vs. big matters as much as small vs. big. If you can work for a profitable small company where you matter and you wear many many hats, you will be far better prepared to make an impact on your own if/when you do start your own company.