I prefer The Fighter -- very much so
I got tongue-tied when I explained to the guy who played George in "The Fighter" why I loved The Fighter so much more. I just landed on the fact that they were mostly loveable Irish American people.
The main character in Raging Bull is just, as one guy posted here, "an @sshat."
Even though I believe that Scorsese is the best director of all time, he didn't make my favorite sports movie ever ("The Fighter).