UBI has less friction as far as implementation since we don't need qualify anyone. With AI, we can afford to have that extra step (nuance) and be able to make sure its a needs based approach. The future requires various combinations of changes. Fix the tax system and then UBI (in this specific order) OR !UBI (needs based distribution).
Implement UBI as part of fixing taxes. A UBI combined with a flat tax plus a national sales tax, and including universal healthcare, can continue to be a progressive tax while eliminating a lot of the overhead of keeping track of it all.
Look at the effective tax rates with a 50% flat tax, 25% sales tax, and $2000 per month UBI with UHC.