I did this thread already http://www.killermovies.com/forums/showthread.php?s=&postid=7808160&highlight=ultron+vs+braniac#post7808160 . great minds think alike.
Originally posted by Lord Feron
In a straight fight Ultron should beat the ever loving crap out of Braniac.
Do you know what Brainiac's ship is capable of? If that's Pre-Crisis Brainiac, he takes the solid majority. He was also capable of overiding all kinds of tech and has tech throughout the universe and time. Brainaic was a beast.