Huhu, this is certainly a tough decision. And if she does opt to reach for personal EGO, it necessarily entails facing a mental ordeal with a real chance of failure. Even for someone like Kali there had to be a suitable challenge to her worldview put in place to spur it.
As for what X would believe, she tells others that they should prioritize themselves more while failing to do the same herself. Though she won't say it out loud:
[X] Prioritizing others
Madoka: "I learned it by watching you!"
I feel the Madoka at the end of the anime would reject this dichotomy even while busy deleting herself from memory. It's not even something trite like godhood ascending past the need for happiness, she simply would not be happy with an outcome that settled for less. Though obviously we don't have the Madoka at the end of the anime.Will you surrender your life for a cause, or will you preserve your own happiness?
As for what X would believe, she tells others that they should prioritize themselves more while failing to do the same herself. Though she won't say it out loud:
[X] Prioritizing others
Madoka: "I learned it by watching you!"