For my money, Rucka's is the best version, just because he's the strongest writer of the group. Dixon's is good, but it's torn between the kind of story Dixon likes to tell and his attempts to reframe the original story.
Don't let my kvetching scare you away from Cry for Blood, Birds of Prey, or Year One. Year One is definitely the weakest, but it has really nice art by Cliff Richards (one of my favorites), and the Birds of Prey stuff is really fun for a fan of that series.
Cry for Blood is a really excellent work - one of the best Rucka's ever done, with sublime, minimally colored noir art by Rick Burchett, which really pushes a lot of great storytelling past what's expected. It's the best of Rucka's Detective Comics run without a lot of the worst elements (mostly Batman's characterization as that run went on).
The core of my Huntress, though, is always Gail Simone's Birds of Prey, particularly 57-108. 100% recommend!