I don't mean which of the robin is your favorite... The question has been raised several times and considering the long run with tim drake the answer is pretty clear for me.
I mean Bruce wayne always acted like a surrogate father with his robins and although parents are extremely uncomfortable with this subject for obvious reasons they ALWAYS have a favorite. Someone who is closer to their dreams or that just knows how to appeal to their best side. The favorite is not even necessarly the best, sometimes they prefer the weakest child precisely because they can protect him and the relationship never changes. Now most people try to be fair to all their children but there's always a hint of a preference. I'd say batman is pretty fair but he's still a human being...
In the miller dark knight world it's made crystal clear that batman preferences is 1-kelly(althought in DKR2 it looks more like pedophilia... ) ,2- jason todd (that he respects ) , 3-dick grayson (that he pretty much despises).
In the DC canon before New 52 he had plenty of guilt over Jason death and one might wonder if he didn't develop some kind of special bond with him over his failure. As he had been freshly introduced to damian his feelings toward him were uncertain and he seemed to mistrust him .
In the new 52 in the batman and robin book he refuses to let damian go on patrol because although he's ready to expose himself to danger he doesn't want to expose his son. I don't have a great knowledge of batman history but it seems to me that's unprecedented.
What do you think?