Just need to have something cleared up.
Other Thoughts
This allows you, on any defensive item, to use either the Armor or block benefit with one use and take the more advantageous effect. It also means that you can get a benefit on odd-numbered Lore scores, and make a defensive item even if you only have Average Lore that doesn't totally suck, because you no longer have to cut the shifts in half twice.
Am I right in interpreting this to mean I get to choose which effect I use every time I use the Item?
Or do I get to choose when I create the item, and then its fixed?