I'd say Mangog and DD are fairly equal before that sun showing...
The wildcard is Hulk. As much as it pains me to say it, he should win. That HOTM showing was ridiculous and he needs a few more appearances so we can at least guess where he belongs.
Doom performed surgery so that Banner would forget the pain that he was plunged into the moment that all that he ever desired died. Caiera, and his entire kingdom had been destroyed by the nuclear powered space capsule that brought him to Sakaar. We should never see the Hulk at that level again. At least while being able to instantly ramp to solar system wide destruction levels, and beyond.
Not this time Abhi. We can't just assume to scale a dynamic strength level like the Hulk. We go off of what he was at during that moment.
DD doesn't ramp up in strength like the Hulk does and did during HOTM. It wasn't a shared feat between him and Betty. This has already been debunked unless we willfully ignored the way that Red Hulk's powers worked.
HP/DD showed an extreme toughness, but he wasn't invincible, just beyond anything that his opponents could bring in terms of power. HP/DD was nowhere near WB Hulk's level of strength going strictly off of power stunt feats. We could however make up stories in an attempt to scale HP/DD to those levels, but it has yet to be re-written where he was able to throw around enough power that would destroy entire solar systems.
Fan opinion at this point would technically hold no weight on what is already canon. You know that I'm right.
Mangog has yet to convince me that he was ever at the level of WB Hulk in terms of physical might. I think he'd be blown away, or beaten into mush. 133.5 Hercs while calm?... Ridiculous level of power when we consider that he hadn't even entered the Dark Dimension at that time, and while under the same writer.
The Dark Dimension was as large as a solar system. That was Umar's kingdom that she said that he had destroyed it. One punch, not an entire fight. Orion would get smoked far easier than Doomsday, but both still get smoked.
Was this Orion showing written under the same writer as Hunter Prey?
If not it's an opinion taken straight out of left field and completely irrelevant to the topic.
Quanchi was right, though. Doomsday can't adapt past physical might, and has never tanked physical attacks that can one-shot a planet, let alone as a side-effect. World Breaker Hulk is completely beyond Doomsday's capabilities.