The FJG has some advantages that UBI lacks:
- Buffer stock of employment, and facilitates transition of the chronically unemployed to the private sector
- Can be used toward social ends (infrastructure, beautification, etc)
- Is sensitive to economic cycles. FJG utilization would increase during contractions and fall during expansions
- The FJG wage would be the new effective minimum wage. In conjunction with 3 and 1, it would also encourage price stability
- Alleviates the social ills that accompany unemployment. These are not limited to material wealth but also include community building and sense of purpose/dignity.
As for UBI/FJG being ‘paid for’, I think this is only an issue due to popular misconceptions (both within economics and the general population). MMT has shown this pretty conclusively IMO.