เธอชนะการแข่งขันประเภทคู่มากขึ้นบนดินเหนียวหรือบนสนามแข็ง ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
has she won more doubles tournaments on clay or on hard ?It is not neccessary to use all the tables.
 table_204_47:  id [ number]  "outcome" [ text]  "no." [ number]  "date" [ text]  "tournament" [ text]  "surface" [ text]  "partner" [ text]  "opponents" [ text]  "score" [ text] 
SELECT "surface" FROM table_204_47 WHERE "surface" IN ('clay', 'hard') GROUP BY "surface" ORDER BY COUNT(*) DESC LIMIT 1