I liked each one because of specific reasons. The Wooden Shields you have to start with and are more useful in Lanayru because of their strength against electricity. The Iron Shields are only really useful in Eldin because they're fireproof, but you will always take damage from electrical attacks and both of these shield trios are worthless against cursed enemies. The Sacred Shields are great for all special enemy attack types (electric, fire, and curse), but the durability pretty much requires you to block enemy attacks with shield bashes, since those block everything including shield damage. And let's not forget that the undead Cursed Bokoblins run from it, which is just funny. And finally, the Hylian Shield is basically the same as the Sacred Shields, but has the durability meter length of the strongest Iron Shield and is completely invulnerable, as well as being the classic shield of the entire series.