I'd say go with the startup, even if you fail you wont regret it, but if you go for a job and then let the project die, you might end up regretting that. If th

I'd say go with the startup, even if you fail you wont regret it, but if you go for a job and then let the project die, you might end up regretting that. If the other founder is taking a job thats fair enough, support his decision but see if he can commit some time to it on his off-hours. Either that or try to find a third cofounder and see if you can reduce the other guys equity and let him become a silent partner or something. Either way, go for the project, i'm more most others on HN will say the same, we're biased in that way.