I did research on these two in the upcoming DEATH BATTLE by ScrewAttack from those who are experts and thought of who could actually win.
Why Ultron wins:
+ He's fought planetary-level beings from the likes of Hulk and Thor
+ Has an Adamantium armor even Thor's Mjolnir can't bend easily
+ Has tech that can surpass even Galactus
Why Ultron loses:
- His other robotic parts aren't made of Adamantium, thus easier to break
- Being a robot, he can easily be infected by the Maverick Virus
Why Sigma wins:
+ Maverick Virus can infect Ultron
+ Able to download himself from other upgraded models
+ Archie Sigma is stronger than his game counterpart
Why Sigma loses:
- Has never met a robot with Adamantium armor
- Has yet to face someone like the Avengers
Ending in a draw:
Ultron wins, but Sigma infects Ultron via infection, becoming Ultron Sigma (Not really, but I wanted it to happen though, I'd be cool)
Honestly, I'm fine with either winning as Marvel and Capcom has a bad losing streak (mainly Capcom with Akuma being the only one victor)
