If you have to choose between the following, what would you choose and why?
Do you want money or interesting work. (Select only one answer)
I firmly believe both opportunities have interesting and challenging work. One seems to have a product and vision, I can't seem to wrap my head around. Other has a more straight forward product that could be commercialized. If it could be scaled, is another story and hence the question about proven founders.
If you put it that way, then go with founders who have good connection, track record. Also, TC or GTFO
Successful founders know how to pivot, they have contacts. Both must to have