i have used ALOT of screen protectors in my day, here is a quick run down of my personal observations.
Verizon: these are terrible. way over priced, scratch more easily than the fortified glass alone, corners peel badly, etc. if you are interested in this level of protection, for whatever reason, here are 6 of them and a cleaning cloth for $2.30(
click). Pretty sure they are more than that a piece at VZ.
Zagg: These are the thickest screen protectors i have used. Scratch protection and drop protection are awesome, but you give up some screen clarity. If you are prone to clumsiness or work/play in a rough environment, this would be my suggestion.
Skinomi: These can be found cheap, they have a slight "rubbery" feeling, but not nearly as much as the Zagg. Scratch protection is good, drop protection is above average. There is very little, if any, screen distortion. Overall a pretty good choice.
KlearKare: read Skinomi, subtract $2 from the price. These are my personal choice. Good all-around protection and super cheap to replace if you have to. Already have 1 in hand for my GNex.
Steinheil Crystal Clear/Ultra: these live up to their name. there is no "tacky" feeling, and 0 screen distortion. however, like most dry application protectors, they scratch pretty easily. they are also expensive to replace. if all you are worried about is screen quality and/or you always keep your device in a holster, go this route. i would not recommend it for pocket carry, they will scratch, and replacements are not cheap.
Steinheil Ultra Oleophobic: Same scratch/replacement issues as the Crystal Clear, but you lose a lot of screen quality. The matte finish gives a serious "blur" effect. If you are OCD about fingerprints, this may be the choice for you. I, personally, find that fingerprints you can wipe off are preferable to a screen that is constantly distorted.
have not tried: XO, Ghost Armor, Steinheil Flex, or PhantomSkinz. I would love to hear a review on those from anyone who has.