That is a fair point about being able to choose both traits. I should have pointed out in my first post that the Mancer's Silverswordsmen use the experience trait and not the veteran trait, which makes them more expensive than they should be.
Ah, then that is just plain silly that Silverswordsmen didn't use the vetran trait as well.
Unit_Medium_Mancer - Silver Swordsman
Unit_Magic_Heavy_Mancer - Platinum Knight
Are the only units using Experienced - when they have the ability slots available to use Vetran as well.