I like how skyward sword did not make it easy to get the Hylian Shield. I Appreciate the Hylian shield the most in SS because it is indestructible as opposed to the other shields in SS. I also like the mirror shield from OoT and WW.
I'd have to say the Hylian Shield since it's classic, but if I pretend that that's not an option, I'd have to say it's a tossup between the mirror shield in OoT and the Goddess Shield from SS. The mirror shield just looked cool and the Goddess Shield could heal itself!
OoT Hylian Shield. I like it more than the TP version because it has a 4th Tri-force piece at the bottom, and although it was stated by Mr. Miyamoto (Either him or another developer) that there is no fourth piece, it does make the shield look cooler than the TP version.