Jason Todd, for me. With Dick being a better Batman and Damian an interesting Robin.
...I don't hate Tim. But he's just "there" for me. And it certainly doesn't help that not only DC, but his fans too, can't seem to come up with a way forward for him after Robin.
I'd feel better about Bruce if he were written more like DCAU Bruce or something. Because, other than a few writers here and there, he's written as a know-it-all jerk that can seemingly never be wrong, nor held to half the standards other characters are (like actually facing consequences for his actions).