Kia su, in case I drop it face forward, the tempered glass offers a measure of protection against breakage of the Gorrilla Glass. Don't believe those plastic ones offer same level of protection. Another factor is smoothness of glass vs plastic films that always felt somewhat 'sticky' to me, glass is oh-so-smooth!
Yep, though out of stock of silicon ones, I do believe have those flip case, I didn't get because I have tempered glass installed, so the flip case may not fit exactly. Best to call Mobile Accessories and check with them....