CREATE TABLE table_204_63 (id DECIMAL, "round" DECIMAL, "circuit" TEXT, "date" TEXT, "pole position" TEXT, "winning driver" TEXT, "winning team" TEXT, "trophy winner" TEXT)

who appears more often , christiano citron or philip cloostermans ?
SELECT "winning driver" FROM table_204_63 WHERE "winning driver" IN ('christiano citron', 'philip cloostermans') GROUP BY "winning driver" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "winning driver" FROM "table_204_63" WHERE "winning driver" IN ('christiano citron', 'philip cloostermans') GROUP BY "winning driver" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1