I will predict this one and any other hypothetical match ups involving Miller, once he faces a live body. Until then we have no clue.
Tubbs would outbox Miller the same way he boxed against Tyson in the first round of their fight except if Tubbs went inside on Miller he could take the punches better than he took Tyson`s hook because Miller`s punches are ponderous and don`t snap like Mike`s.