@Zen: I'm not so sure who would win a fight between Batman and Spiderman (my two favourites btw). Both do extensive research on their opponents when possible, both are fantastic scientists, and both are highly adaptible to rapidly-changing situations.
Now, for the differences: Peter Parker has amazing agility, and would therefore be able to dodge anything Batman tossed at him. He's also much stronger and has all the spider abilities. However, Brucie has many more resources at his disposal to help find a weakness--perhaps something that dissolves webbing or something. Also, I suppose Batty could kidnap Mary-Jane, but aside from him not being that type, Spidey always kicks her kidnappers' asses!
We must also factor in that most of Spidey's enemies are also great scientists or hunters--Green Goblin, Dock Ock, Mysterio, Kraven... list goes on...







