Think I should elaborate
Personally, I liked the 60's, and the Shumacher batmobiles as a kid, but now I think they look a little too silly.
I still love the Burton batmobile, cause it fits the dark yet comical tone of his films.
But I loooove the tumbler, cause, as ROCKMAN X pointed out, it's a feakin tank.
The thing's a beast, just listen to it roar, and it's got a motor cycle as an escape pod
EDIT:
Yeah as a lot of people pointed out, need to see the B v S Batmobile in action.
That being said, I love the design, I think it strikes a happy balance, between the tumbler, and and a more traditional batmobile (I actually heard it was meant to be a mix of Burton and Nolan's batmobiles)