For most of the early hires you make in a startup, experience doesn't matter very much, and you should go for aptitude.
I myself used to believe ideas didn't matter that much, but I'm very sure that's wrong now.
It's become popular in recent years to say that the idea doesn't matter.
Experience matters for some roles and not others.
The single word that matters most I think to keep the company productive as it grows is alignment.
Before product/market fit, your only job that matters is to build a great product.
There's no way I know, to get through the pain of a startup without belief that the mission really matters.
Startups are very hard no matter what you do; you may as well go after a big opportunity.
No matter what you choose, build stuff and be around smart people.