They are completely different stories. One is about fighting during warfare, the other is about surviving as a medic during warfare. There is barely anything to compare in these two storiesIn a way, I like this over Youjo Senki. Touri has a reason to become a jaded pragmatist. The world she lives in is just that vile.
Tanya was an ass before being sent to a comparatively less dangerous scenario. Say what you want about Being X, he makes Tanya's world challenging but manageable. Touri has to make do with whatever God-forsaken hand she's dealt at any moment.