100% a matter of personal preference. I4's look sick in my opinion, but not everyone's head was made for them. When you think about it, though, the only real part that's being exposed with the I4's is your law line and that's bone. I assume it won't hurt as much as a regular hit on a body. The new Flex's look ridiculous. Once again, that is just my opinion. I have never been a fan of Events so I can't say much there. You're never going to find the "best" mask; just the mask that you like the most.
"I assume it won't hurt as much as a regular hit on a body."
I stand corrected... http://www.pbnation.com/showthread.php?t=3067765