CREATE TABLE table_203_344 (id DECIMAL, "#" DECIMAL, "date" TEXT, "opponent" TEXT, "score" TEXT, "win" TEXT, "loss" TEXT, "save" TEXT, "attendance" DECIMAL, "record" TEXT, "other info" TEXT)

which team was the opponents of this team the most ?
SELECT "opponent" FROM table_203_344 GROUP BY "opponent" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "opponent" FROM "table_203_344" GROUP BY "opponent" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1