CREATE TABLE table_204_737 (id DECIMAL, "year" DECIMAL, "order" TEXT, "quantity" DECIMAL, "ger nos." TEXT)

were there more n31 or e34 ordered ?
SELECT "order" FROM table_204_737 WHERE "order" IN ('n31', 'e34') ORDER BY "quantity" DESC LIMIT 1
SELECT "order" FROM "table_204_737" WHERE "order" IN ('n31', 'e34') ORDER BY "quantity" DESC NULLS LAST LIMIT 1