Keaton's batman was experienced and could fight excpetionally well, his fight with the dude with the swords showed this. Keaton's Batman also was a shit-ton more technologically advanced than Bale's. If Ledger's Joker had to deal with the BatWing or a FULLY evolved Bat-mobile he would shit his pants. Also I think that Keaton's Batman was more merciless and would have no trouble killing the Joker if he needed to.
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"Some people never go crazy. What truly horrible lives they must lead."
^Could Keatons Batman free all the hostages in the building, take care of the SWAT team, stop the Joker from blowing up the boats because he knows he's out to kill him and still not end up looking just as bad as the Joker? And even then, Bales still had better tech.
All the ways you wish you could be, that's me. I look like you wanna look, I **** like you wanna ****, I am smart, capable, and most importantly, I am free in all the ways that you are not.