from a financial POV working for a startup is--how should I put this?--suboptimal. Your equity is probably worth nothing (even if you get acquihired, liquidation preferences probably mean all non-founder stock is worth $0). The hours are worse. The benefits are worse.
This has been my experience over a 20+ year career of working mostly at startups. If you choose to work for a startup, assume the equity will be worthless. Don't even factor it in to your compensation package. It's a false lure.
In many other ways, though, I don't regret working for startups. They're fun and exciting, at least when you don't have a family, and you can learn a lot in a short amount of time. They're good proving grounds for anyone with an entrepreneurial bent, in my opinion.