I used the Goddess Shield for most of the game. As soon as I bought the Sacred Shield I had all the resources I needed to fully upgrade it, so I did. I didn't bring it into the Ancient Cistern, though, because I didn't want the advantage against the Cursed Bokoblins. As soon as I completed the dungeon, though, I used it for the rest of the game and never switched. My second most used shield was the Iron Shield, in its various forms, because it's hella cooler than all the others. Favorite shield appearance of the game.