Would you quit your startup and go for a job?

I'm in following situation: I started a startup with my best friend one year ago. We already had startups before and this is our third one. Right now we are 8 ppl. and can pay a minimum salary. The startup is about matching refugees into jobs (living in Germany). We had an agreement with a large "temporary work" company - they gave us a lot of "jobs" so we could fill our job feed. When we had the meeting with the "temporary work company" we all said before: "Ok - when they don't give us money we are at the point to give up". And so it came. The thing is that it will take minimum 2-3 month that they start paying us - even far away ofc from an income stream that is sustainable. The feedback tough in general was positive. But then something crazy (as usual in a startup) happened. Another startup in that field came to us and offered us a fusion. They have a more "manual" approach to helping refugees getting into jobs - and so they have funding and also some success. The others will definitely go on - but my opportunity cost is now high since I got a great offer from another company as teamlead. My ideal plan was to work for 1-2 years and then start another startup with my friend where I'm more passionate about. The problem with the fusion is also that it will become an NGO. So - can anyone give me some hints on what to do? Anyone in a similar situation? I can't decide for weeks now and don't know what to do....