I may be wrong but can't Ultra Boy only use one of his superpowers at a time? If that's the case Black Adam murders the kid 10/10.
CAP
CaptainStoicAvenger
I think that he can use them more fluidly now thanks to Karate Kids training. I think he can surpass Adam in strength, and when he becomes invulnerable Adam wouldn't be able to hurt him. I think this fight may be better than you think.
PSY
Psyquis52Magik Blackheart
He can use them very well but Adam is one hell of a bada$$.