UltronvsBastion

Bastion The result is a tie...They both cannot destroy each other. here Ultron is considered the likely victor due to his nearly indestructible adamantium shell and superior offensive capabilities. However, Bastion’s upgrades and the incorporation of technarchy and Nimrod technology could make the battle closer than expected (bastion has advanced regeneration and adaptation abilities, to counter Ultron’s strengths).

So i vote for Bastion cause he possesses the same regenerative abilities as Nimrod The Hunter (Nimrod) - Prime Marvel Universethat can rebuild itself even from a single atom if its body is destroyed ( In the comics, is the Nimrod The Hunter (Nimrod) - Prime Marvel Universeability to rebuild itself from a single atom and adapt to any situation makes it an incredibly tough opponent),Coupled with the power to go toe-to-toe with a reality-shaping entity like Legion (David Haller) - Prime Marvel Universe, Bastion would indeed be a formidable force. (Legion (David Haller) - Prime Marvel Universehas "reality-warping abilities and multiple personalities" with different powers but bastion can counter every single like Nimrod The Hunter (Nimrod) - Prime Marvel Universe.. Nimrod The Hunter (Nimrod) - Prime Marvel UniverseIt is a self-sufficient machine capable of regeneration and adapting to attacks, which allow him to develop countermeasures even against Legion (David Haller) - Prime Marvel Universe).

So in that case I believe thatIn a cybernetic battle, Bastion’s potential for hacking and reprogramming could give him an edge over Ultron, especially since he can take advantage of his advanced technology to find and exploit any weaknesses in Ultron's systems with ease as he can adapt to any omega-level mutant power, ultron's defenses and efforts would be futile.