Have founded a startup, worked at a startup and worked at several fortune 500s and I can say the most interesting thing on my resume for the fortune 500 interviewers is by far the startup experience.
Showing that I can pull my weight, have a sense of leadership, drive, ambition, etc are traits that every employer wants to see but not many employees get to flex.
I've heard this from multiple Fortune 500 hiring managers, too. And of course it's doubly true for founders and hiring managers at startup and growth-stage tech companies! Just about every experienced person I know in startup-land thinks that resumés that show only big company experience are a negative hiring filter.
Showing that I can pull my weight, have a sense of leadership, drive, ambition, etc are traits that every employer wants to see but not many employees get to flex.