A hard choice, hard as any in the Tourney proper.
Harrions's art in The Out is more sophisticated, with a LOT more going on in the background, but I've a real soft spot for Ian Gibson's work, and especially in Book 3 he really does tickle the emotions in a special way, he brings a lot of weight.
On balance, based on what has been told so far, I'm going with Halo Jones as marginally 'better'. As Funt said, the character(s) are a touch more sympathetic, the sitaution just a little more accesible and, frankyl, some of the basic storytelling is just easier to follow in Halo Jones and I value that a lot. Some of the big ideas in the Out, though, are giving me more to chew on, and that's no small thing, to out-imagination Alan Moore...