The useful question is not who is stronger. It is how the same story-world makes two different identities legible.
The fundamental tension of Re:Zero lies in the conflict between the comfort of a pre-written script and the agony of emergent agency. Roswaal L. Mathers and Subaru Natsuki represent the two terminal responses to a world governed by fate. Roswaal operates at a YPS-4 scale, wielding enough magical influence to act as a national deterrent, yet his DNA profile reveals a man who has entirely surrendered his self-determination to a singular, archaic obsession. His low Ego score reflects a life lived as a secondary character in a tragedy written by someone else; he masters the elements only to serve a fixed timeline. In contrast, Subaru exists at a YPS-2 level, physically bounded and strategically limited, yet he possesses extreme Growth and Bonds. While Roswaal uses his centuries of knowledge to enforce a specific, predetermined outcome, Subaru uses his repeated failures to expand the world's possible futures. A direct comparison of their capacity fails because they operate on different planes: one possesses the scale to destroy, while the other possesses the leverage to change. Roswaal is a man attempting to force the world into the shape of a dead woman's memory, whereas Subaru is a man reshaping his own identity to survive a living, chaotic world. Roswaal's low Luck is the inevitable result of his deterministic path, while Subaru's high Luck functions as the narrative weight that prevents his psychological trauma from collapsing into total erasure.