I dunno ive never heard Juvenile Hell.I dont think it is on the same level as either The Infamous or Hell on Earth.
They didnt really diss Pac.2Pac was mad because on Survival Of The Fittest Mobb Deep say "Thug Life we still livin it".This was while Pac was in jail.He saw this as a diss.Dont know why,Pac wasnt the only one that lived the Thug Life.2Pac sent members of Thug Life to a Mobb Deep concert.They started shouting shit at them and Mobb Deep never even acknowledged them.I think that is waht happend anyway.Mobb Deep were bitches for releasing Drop A Gem on Em but i think Pac shouldnt have dissed Prodigy about his sickle cell.