Well, the movie would be great either way, but I think a CG movie is what the Miller Bros would prefer, since they're big on animation. The Incredibles proved that you can make an exciting animated movie that adults can enjoy.
The Incredibles was Pixar, and Pixar does things with animation that no other company can (as of yet). And the theme for HB would be much darker then your average animated movie. Just look at the animated movies that have come out lately. Then take a look at the animated movies that were serious for the majority of the film. Nowadays, you think animated movie, and you think a comedic kids movie. And I don't think that's the category HB would fall under.
Well, the action would translate better in live-action, but I think the humorous moments would be great in animated. I'm not sure I'm ready to see Hunter in his underwear in live-action. (Referring, of course, to the scene where he first meets Hope and Sam.)
how much better would it be in animation you are still seeing the same thing liveaction or not and if they get really really I mean some A list or B list actors you could do chest up shots hope and sam's facial expressions some eye gestures or some added diologe your audiance wold get the point