Ultron beat Watcher, who can prevent the destruction of a timeline (multiverse). Ultron doesn't even notice the Star Wars universe.
i mean there are people in the SWU who could possibly give ultron a run for his money
I doubt that. Ultron is multiversal. A timeline in the MCU has infinite dimensions as stated by the Ancient One and each timeline has its own Dormammu and Dark Dimension, which is a dimension that exists outside of time.