Quote Originally Posted by CBR
Well it depends how you are going to use the cavalry. Cataphracts have better overall combat power: att/def 7/23 v Companions 10/17

So Companions are best when doing the rear/flank attack while Cataphracts are better at the frontal attacks.
That's exactly what I had expected from Cataphracts/Companions... but I'm having the impression that Cataphracts perform better on both occasions.