Gigantomachia has better strength feats. Whilst Youpi has better speed feats. He also has the lethality advantage due the rage incarnate form.
Their durability seems equal.
I dont know. Gigantomachia can increase his size, thus his strength. Whilst Youpi gets more powerful the angrier he is. Youpi however seems intelligent and may form a hatsu that may deal with him.
Anyways Ill give it to Youpi, the Hxh verse seems vastly faster than the MHA verse.
I am quite undecided here and it is a shame that a lot of people either read MHA or read HxH.
From what I can see Giganto has the strength advantage. Youpi is a powerhouse, among the ants he has the best body (except Meruem obviously), even without aura Youpi is mad strong but he also have an insane aura like 500.000 or so when Morel has 70.000.
And he can shape shift to be stronger. If young Gon or Uvo can destroy the ground or huge boulders someone like Youpi scale quite higher.
But here Giganto has huge strength feats while being casual. The guy can tore a part of a mountain, he can run through the ground like it was butter, can destroy huge chunk of ground etc. He was never hurt or had a single bruises for all the show. He can sent huge part of buildings away, can turn 25m large and play with giants people etc.
The guy seems to be night invincible and extremely strong. He has also great endurance and can fight for days.
The only issue here is speed. While I don't think Giganto is "slow" I think he will be slower than Yupi. and Yupi can fly too. Yupi also has can also grow multiple eyes. So he will be hard to touch.
Youpi rage blast will be useful but from the range they had I think they can hurt a bit Machia but not heavily. He will need a lot of rage blast to put him down.
For now I will maybe give it to Machia is a very hard fight because of the casual and the never all out factor. Machia was never pushed above low diff. So I think Machia can do more and even just from what he already did I think he can do it.
Some can say that Youpi never went all out too and was never really hurt too but but I think he was pushed more than Machia.
Machia very high diff. (but this can honestly go either way)