Startup versus "startup-like" environment at a large company?

I'm being offered a 3 month contract to hire software development position at a local startup, while waiting to hear back about a likely offer from a local large company promising a startup-like environment.

I've been informed that it reached profitability last year, and has roughly doubled it's income rate for the first quarter of this year. I worked briefly at one last year that went under, and then took some time off to focus on my life (got married, bought a house, etc.).

I probably have an offer for a test automation position coming from another large company who is offering a "startup - like environment : innovative, minimal legacy technology, high energy but safer funding and saner work hours", but I haven't been able to confirm it yet.

The salary is competitive, the technology is cutting edge, and the coworkers I've talked with have been amazingly talented. As a small startup, I know the hours are likely to be intense, the technologies and learning curve broad and steep, and the rewards potentially greater.

Both positions are interesting and if I didn't have both options, I wouldn't hesitate to take the other. If I lean towards the startup, I'll probably have to be convincing my wife, parents, and in-laws that it is a good idea, but I don't like that being the main deciding factor.