Armour and Shield - There are some differences in the remaining shield and armour rigs. Both shield and armour have repairer/booster cycle time rigs, which increase their cycle time by 15% Eve isk, but only armour has the repair amount rig.
Shield obviously has a shield recharge rate rig while armour, of course, doesn't have a recharge rate to begin with. Both have rigs to increase hit-points, a 15% bonus for 50 calibrations.
While this may appeal to people on some setups, hit-points are usually less useful than increases to tanking the incoming damage. Hit-point rigs will simply make you last 15% longer, while rigs that increase the damage per second you are tanking are likely to help you repair more than 15% more armour or shield over the course of a fight.
In essence, repairing damage is like adding extra hit-points during the fight and you're likely to add more than 15% of your total over the course of a fight, especially on unplated ships and Battleships.
On the plus side for armour users, the remote repair rig Remote Repair Augmentor I decreases the capacitor use of remote armour repairers by 20%, which stacks with the bonus on a logistics ship for some amazingly efficient repairing.