Capcom praised Sakura abilities, telling us about his talent.
During SF Alpha 3, they stated that her ability to manipulate ki was at the same levels of Ken's.
As far as I know, SNK never praised Yuri's abilities. And during the first Art of Fighting, IIRC she didn't have a proper training yet (Takuma teached the kyokugen karate between AOF1 and AOF2).
I think Sakura wins.