To be honest I think Bruce is remarkably consistent, except for the a**hole Batman of the early 2000s and the developmentally-stunted child of Snyder's run. Plus, Tom King's abomination. But, y'know... for the most part.
EDIT: Well, Bruce was definitely a better character before every writer became obsessed with doing their best Frank Miller impression. There definitely is a disconnect between pre- and post-Crisis Bruce, even though some like Morrison have tried to mend the gap.