If you mean **physical strength**, **Superman** by a huge margin.

If you mean **who wins in a story**, it depends:
- **Superman** is vastly more powerful: strength, speed, flight, heat vision, durability.
- **Batman** can sometimes win with **prep time**, strategy, gadgets, and exploiting weaknesses like **Kryptonite**.

So the usual answer is:
- **Raw power:** Superman
- **Tactical/intellectual edge:** Batman
- **Overall in a fair fight:** usually Superman
- **Overall in a comic-book plot with preparation:** Batman can find a way

If you want, I can also compare them in:
1. hand-to-hand combat  
2. intelligence  
3. who wins most often in comics/movies
