I own two i4's, two Grillz, one flex, a profit and I have E-Flex ordered. Yes, I'm a whore!
I guess that it would come down to personal preference and fit. The most important thing is to be protected. Some of the guys on my team have bigger melons so they don't fit the i4. They wear the profit or the Events. Personally, I am in love with the i4 at the moment, so that's what I use primarily. It's small profile and great spherical vision system can't be beat right now. I hardly know that I'm wearing them. Go and try multiple masks at your local shop and make your own opinion.