I am so confused about ceramic vs porcelain vs tourmaline.......ahhhh

It seems like tourmaline is a good thing? But I don't know about a 1/2" iron? My hair is just at my shoulders so probably not a big deal?

Help me choose one!

Chi 1" Ceramic
http://www.nobetterdeal.com/shop/en/nbd/ceramic-1-inch-flat-iron-by-chi-hair-products-ceramic-flat-iron-b0009v1yr8--1

Chi 1/2" Tourmaline Ceramic
http://www.nobetterdeal.com/shop/en/nbd/-b006he8agy--1

Babybliss Pro 1" (porcelain ceramic)
http://www.nobetterdeal.com/shop/en/nbd/babyliss-pro---porcelain-plate-ceramic-flat-iron-b003h0u5by--1

Thanks!