It was difficult to pick between DJD's and Wyverii's at first, but when I got down to really examining them, it came down to two factors:
1) DJD's is the only slated sprite that has Mollux's pseudopods spiral downward, matching the artwork, rather than upward.
2) Although it's small and only barely noticeable, I really like that DJD's sprite is posed such that it demonstrates the transparency of Mollux's shell.
After that, I put Doran's above Quan's for two reasons:
1) Like DJD's, I really like that Doran's Sprite demonstrates the transparency of Mollux's shell.
2) I dislike most Pokemon sex differences in general, and I especially don't want to see them on this CAP.