Not sure that they're really comparable. I know there have been some "liberal voice" qualities to both of them, but how they're being written right now, they're not very comparable. That being said, if I could only pick up one of either Mark Waid's current Daredevil or Jeff Lemire's current Green Arrow, I'd be picking up Green Arrow.
@super_geoff: "Affleck taste out of your mouth?" That sounds incredibly dirty :P But the Director's Cut is actually a very solid film, and one of my favorite comic book movies.
OP: Umm...Green Devil? No...Dare Arrow? No...Oliver Murdock? No...Matt Queen? Why do I have to choose!?
DD...He's had some of the best runs in comic history. Miller, Waid and I guess Bendis (I disliked the Bendis DD, but lots of folks liked it.) GA has had the Grell run and Lemire currently, and O'Neil and Adams when he was co-starring in GL's book. While that's not too shabby, I don't think it's as good as what DD has had.