I’d mused earlier that Clark Kent, not Superman, is the more interesting character (and unfortunately, the various incarnations of Superman on the movie screen have seen fit to ignore my opinion).
Kevin D agreed with me, but made an offhand comment that the dynamic is inverted for Bruce Wayne/Batman. I have to disagree. Bruce Wayne as the mask, rather than Batman, makes the character much more shallow. The genius of the Batman movie reboot with Christian Bale was that they made Wayne the focus, with Batman being a mere persona, just another tool in his arsenal (a psychological one).
I am more interested in Bruce Wayne and Clark Kent as characters than in Superman and Batman. A Wayne/Kent story would be ideal. A Batman/Superman story would be 2-dimensional and dull. Both these men are more alike than the differences in their costumed personas indicate.
I’ve no doubt this has been explored in the comics at some point but frankly these characters are more interesting to me on a screen than on a page.