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The answer is "flat" women, but with the bone structure that women had naturally for thousands of years, prior to the modern degenerate era.
A man might prefer "thick" women because they approximate the robustness that women once had; on the other hand, a man might prefer "flat" women because they are healthy and lean like women once were.
Healthy women, in paintings, sculptures, and old photos, had thicker torsos, more developed buttocks, generally flatter chests, larger and more prominent bones, and more aesthetically appealing faces than your modern soi-women.
Newfags only see bodyfat and muscle. Oldfags can see bone structure, where muscle is attached. Bones are more important than how much fat a woman has, but idiots don't see things this way.