Is that good?
Level 30 (4 420 577 xp)
Strength: 18
Agility: 18
Hit points: 59
Skills to attributes: 2
Ironflesh: 3
Power Strike: 6
Shield: 5
Athletics: 4
Riding: 5
Horse Archery: 0
Power Draw: 0
Power Throw: 0
Weapon Master: 6
One Handed: 135
Two Handed: 1
Polearm: 100
Archery: 1
Crossbow: 1
Throwing: 1
IMHO, the best build is 21/15 unless you want to ride mamluks/plated chargers.
Try this:
Strength: 18
Agility: 18
Hit points: 59
Skills to attributes: 2
Ironflesh: 3
Power Strike: 6
Shield: 4
Athletics: 6
Riding: 6
Weapon master: 4
You can fight as well as foot as a horseman. If you will go to 18agi, max agi and riding. Weapon master 4 is enough. With shield 4 you can wear a plate covered round shield, one of the best shields of the game. Cheap, coverage, durability.