Ben,
Based on my 2⅚ rounds at Angels Crossing and my single round at Diamond Springs, I'd say 7-3 in favor of the latter. Maybe 6-4. Now if I could walk 18 more easily at AC, I might even that up, but you have a hike up to the range, and then back to the clubhouse just to get to the first tee, and then you have several hikes during the first four holes. You've just two hikes - 9→10 and then 14→15 - at DS.
I think DS has a more exciting finish, with the wild green at 14, the decision on line you need to take on 15 from the tee before a delicate approach that might measure 100 yards or just 15, a 16th that demands a progressively accurate shot a you get closer to the green, a 17th that (into the wind, as I played it) demands everything you have (a two-hybrid that carried the ravine by 6-7 yards) to an 18th in a great setting (although needing tree removal by the back tee...) where a back pin position demands the safer line, and a front pin encourages the more testing line that brings the ravine into play on both shots. I didn't see much wrong with AC, and I love its Redan, but I think that I enjoy DS just a little more. (I will say, however, that as a ballmarker collector, my DS coin looks awful in comparison to almost all of my favorites.)
They're just far enough that I wouldn't try to play them both in a single day, but I'd go a two-day 36 hole break to enjoy them both.