In tanking there are a few traits you need to know about to make a choice according to your needs. I will explain the relevant traits, what they do and when you should use them.
Shoulder, Hands, Waist, Feet, Body, Legs, Helm
Reduces cost of block
Sturdy reduces the cost of block. This trait you will use onall your armor. Sturdy has become the only useful trait for tanking. Since the Morrowind update there is simply no other trait that will give you a significant advantage.
The following traits all apply to one-handed weapons worn together with a shield.
Increases enchantment effect
Infused pairs well with a crusher enchant (reduce enemy resistances). This increases the potency and decreases the cooldown of your enchant. Very handy to get some extra resistance debuffs on the enemy.