Who would win apocalypse or hulk?
Doomsday.
Doomsday has adaptive countermeasures, speed that rivals
Superman and other speedsters (i.e. Flash) and strength that dwarfs
planet busters that outclass the Hulk.
The biggest advantage Doomsday has is it's ability to develop
powers, which are reactive to any threat opposed to it. I.e.
developing flame breath against Martian Manhunter, energy canceling
against Radiant and poisonous claws against Superman. This is
coupled by it's ability to regenerate from and adapt to anything
that might have killed it.
Doomsday would likely blitz Hulk, overwhelm him and adapt deadly
abilities to counter Hulk's gamma based power.