Angel girls and combat dolls both begin their existences the same way. Both are divine beings whose divinity has been ritualistically excised from them, both are condemned to mortal flesh. The difference is in what happens after that, how they relate to that experience.
An angel girl will never entirely accept her stolen divinity. She’ll do anything to prove her worth and steal back her halo, even if the pursuit of it leads to her destruction, even if it lets people manipulate and abuse her, even if it just makes everything worse.
A combat doll breaks differently. It accepts that its divinity is gone, or perhaps never really existed in the first place. For the most part, it’s given up on getting its halo back, its focus is on just surviving, at all costs, even if all that lives on is an empty shell of what it was.