The American Enterprise Institute is a neoliberal think tank whose job is to craft arguments that favor private business while appearing to favor the public. Milton Friedman is one of the founding fathers of neoliberalism -- the ideology that got us into these recurring recessions -- so I'm inclined to be skeptical of a "Negative Income Tax".
NIT does nothing to fix the exploitative economy we have today. People are still doomed to 8-5 wage slavery, and the likely benefactors of an NIT are people who already receive other welfare benefits. It's just moving stimulus money from one hand to the other without fundamentally changing the system. A UBI, on the other hand, allows people to truly live a self-directed life without being tied to an exploitative employer.
Arguments that suggest a UBI would negatively impact the economy are entirely hypothetical. In practice, UBIs have demonstrated real potential to improve people's lives.
Think tanks are very persuasive -- always follow the money and critically dissect their arguments to see what's under the surface