I'd personally chose JM, and that's coming from a Dredd owner. JD has it all, the art, the features, the theme, the options (conventional and Super Game), etc.... And for some reason it's a just miss. I don't know how to describe it outside of that. It should be a lot more fun than it is.
I may very well be in the minority here, but I find JM to be the far more enjoyable title.