One vector:
“I always recommend to select an early-stage start-up by evaluating who your manager will be, a far narrower task and one that is often manageable earlier in your career with less beta than assessing the prospects for a startup.
If your manager is stellar, at a minimum, you will learn and stretch your abilities. Moreover, if your manager is an outstanding engineer or director of something or first-class entrepreneur, he will have many exciting opportunities in next 1-10 years and if you are talented and display an outstanding work ethic he will be begging you to join him at his next endeavor.” — Keith Rabois
This is very accurate. Well said, Keith.