[Verizon LG G3] crashN2u:
I've used both of these on both my G2s and G3s and want to share my findings. Feel free to share other brands and your results.

I carry my phones two ways. During work, they are in my shirt pockets where the only things rubbing on them are paper and the occasional dollar bills(between 6-14 hours a day). When not working, I place my phones in my front pocket with the screens facing each other. Keys and change will also be in that pocket. When I only have one phone, the screen faces my leg(between 2-4 hours average). I almost always have both phones at the same time.

iLoome Flex: This protector has a hardness rating of 8H. Despite that, it is flexible. I chose this first because I expected the flexibility to help dissipate any force applied to It. It did it's job well. Over a 6 month time period, it never chipped or cracked until I removed it, where it then basically crumbled to pieces during removal. The fit was good, not great. There was a gap around the edges, but that became a moot point once I put on my incipio case. I did not have any lifting issues like others have claimed. Installation was somewhat easy because of a taped hinged installation design to help figure out placement prior to removing the adhesive protection. There was still some difficulty due to it being smaller and trying to center the gaps while aligning the opening for the sensors. The feel of the glass wasn't as smooth as a bare screen and took some adjusting. In the end I preferred this because it allowed me to be more accurate in my selections and typing. I ended up removing it because after 6 months of use, the screen had become scuffed from use., which makes me question the hardness rating. That being said, I prefer the feel of this over a bare screen.

ZAGG: this protector has a hardness rating of 9H. There is very little play in regards to flexibility. The fit of this protector was superior with a very small gap which disappeared once a case was put on. Installation is the same as every other ZAGG protector, but this was the easiest I had ever done. Because of the great fit, it went on the first time and didn't need to squeegeed. Thinking I got lucky, I removed it and tried again with the same result. The feel of the protector is much slicker than the iLoome and dare I say, even the screen. It really feels like there isn't anything there. Since I've used It, however, the slickness has been a problem for me. I make more typing errors and accuracy has gone down the drain. When playing games like clash of clans where I can tap and hold, I get no response because my finger will almost always slide. It takes 2-3 deliberate tries before I get the desired response. In addition, I get A LOT of accidental screen presses from something as simple as scrolling through a page or feed. I have touch tracking on and the accuracy is off while using this protector by a millimeter or two. Sometimes, touches won't even register. This alone is almost enough to make me switch back to iLoome. After only a month, the screen still looks brand New. As for the actual protection, it was accidentally chipped by someone in an environment where it shouldn't have happened. Clearing away the chipped area resulted in smaller chips coming off. Once it was cleaned, it seemed like ther would be no other damage. Later that night, I dropped the phone about 3 1/2 feet flat on it's face. The raised edges of the case kept the screen from actually contacting the concrete. When I examined the phone, there was now a 1 1/2 inch hairline crack coming from the chip. It is barely noticeable and doesn't feel like it's there. No bubbles or lifted areas. I enabled developer options and tested touch across all areas of the chip and crack and found no loss of function and there was full responsiveness. This is still currently on my G3. I plan to keep it on for a while longer to see how it stands up to daily wear and tear.

I'll update as I continue to use the ZAGG and what I decide to use in the long run as well as other protectors I try out. Again, feel free to share your own experiences with these or other glass protectors.