Ask HN: Please help me decide which startup I should work for?

I am interning this year and I applied for 2 startups focussing on 3D printing technology. One startup consist of some good experienced founders who have worked with google, Samsung before but and their main focus in using 3D scanning technique to create a 3D printed object (and they don't pay). The other consist of young inexperienced graduates and they have a wide domain of projects related to 3D printing also I have a choice to create and start my own project with them and also they pay me good. Which one I should go after!