marvel - Why did Ultron and The Vision disagree in Age of Ultron?

In the Avengers: Age of Ultron,

after the Scepter is first retrieved from Sokovia, Jarvis studies the mind stone within the scepter, and Tony Stark shows Bruce Banner a 3D projection of the mind stone's consciousness. When Stark and Banner try to create an interface to the mind stone's consciousness, the side effect is that the mind stone somehow turns the then potential Ultron into something unintended. ... So the implication is that Ultron is a manifestation of the mind stone.

But later in the movie,

after Ultron and Dr. Cho create a new body for the mind stone, and after Jarvis is uploaded into the body, Thor uses his hammer to bring the body to life in the form of The Vision, which also seems to be a manifestation of the mind stone. If the mind stone is so universally powerful, then why are its two manifestations at war with each other? Why are Ultron and The Vision not of the same mind about things?

The Vision

has the power to reach into a (later) weakened Ultron and purge Ultron's presence all across the internet, and then to destroy the last remnant of Ultron via thought power at the end of the movie, indicating that they both are based on the same power.

Is the explanation that,

while the mind stone cannot be contained, it can be wielded to one extent or another, and that more than one entity can wield the mind stone's power at the same time? So that Ultron is Stark's vision of the mind stone, while The Vision is Thor's vision of the mind stone, and ultimately Thor is able to create and wield a more powerful vision of the mind stone that Stark is able to wield? Perhaps the mind stone's power comes from the same place the Thor's hammer's power comes from?

Can someone who knows this please explain it, along with some references? My theory above is just from watching the movies.

Answer

Ultron 0.5 was NOT the raw "consciousness" of the Mind Stone, but rather it was an advanced AI program that HYDRA had been developing, based on that consciousness.

In the scene where Tony asked Bruce to look at the AI representation, he was analyzing NOT just the Scepter itself, but also the flash drive onto which he had downloaded all of HYDRA's projects and data. Since he wasn't able to salvage all of the data, he and JARVIS were attempting to piece together what HYDRA had been working on. And when discussing this particular project with Bruce, he specifically says that Baron von Strucker was attempting to design an AI program.

TONY: Meet the competition.

BRUCE: It's beautiful...

TONY: If you had to guess, what's it look like its doing?

BRUCE: Like it's thinking. You mean this could be a... It's not a human mind. (pauses) I mean look at this... They're like neurons firing.

TONY: Down at Strucker's lab I saw some fairly advanced robotics work. They deep-sixed the data but... (pauses) I gotta guess he was knocking on a very particular door.

BRUCE: Artificial intelligence.

TONY: This could be it bruce... this could be the key to creating Ultron.

BRUCE: I thought Ultron was a fantasy.

TONY: Yesterday it was.

As for what Tony and Bruce were actually working on, that's covered in the very next lines. They were attempting to harness the incomplete HYDRA AI by finishing it (it still lacked any kind of interface for interacting with humans), and then applying Tony's existing Iron Legion protocols to it. There are also implications that Tony may have used his own brain scans to enhance/finish the AI's interface. The result - and their goal from the beginning, the whole point of Tony's ULTRON Protocol - would be

a fully-sentient version of JARVIS, one that could think for itself and control the Iron Legion. Such a system would potentially render The Avengers obsolete, leaving Earth under the protection of an Iron Legion army.

However, as we witness, the end result is not quite what they expected.

TONY: If we can harness this power, apply it to my Iron Legion protocol...

BRUCE: That's a man-sized if.

TONY: Our job is if.

For the most part, Ultron worked exactly as he was intended to. His biggest flaw, and really the ONLY reason he's a villain instead of what Tony hoped for, is summed up by The Scarlet Witch in a single sentence:

WANDA: ULTRON can't tell the difference between saving the world and destroying it.

---

A Note on HYDRA's Files

While Tony does say that HYDRA "deep-sixed the data", it's also indicated that he was able to retrieve at least partial files from their computers:

When entering the HYDRA base

TONY: Sentry mode. (glances around room and plugs flash drive into nearby computer) Okay Jarvis, you know the drill, I want it all. Make sure you copy Hill at HQ.

NATASHA: We're locked down out here.

TONY: Then get to Banner, time for a lullaby. (looks around room again) I know you're hiding more than files... Hey J, give me an IR scan of the room real quick.

JARVIS: The wall to your left. I'm reading steel reinforcement and an air current.

So, although it's never made clear how much of HYDRA's files were destroyed, it's apparent that JARVIS was able to recover at least some of them - enough to indicate to Tony what they were working on. That, along with the code stored within the Scepter, was enough for Tony to recreate (and finish) the project with Bruce's help.