18/21 and 21/18 are both good for level 30. You could also do 18/18 with 6 PS 6 IF 6 Ath 6 WM and 5 Riding. You can use the long hafted blade on horseback, including the side swings. It's by far the longest weapon you can swing on horseback, so the playstyle is truly unique. Takes a lot of getting used to, much like learning wigglesticks.