CREATE TABLE table_203_581 (id DECIMAL, "club" TEXT, "chinese" TEXT, "city" TEXT, "home stadium" TEXT, "capacity" DECIMAL, "average attendance" DECIMAL)

which club had the highest average attendance ?
SELECT "club" FROM table_203_581 ORDER BY "average attendance" DESC LIMIT 1
SELECT "club" FROM "table_203_581" ORDER BY "average attendance" DESC NULLS LAST LIMIT 1