I tried on the DYE I4 when they first came out. Just too small for me. Not that I get hit alot in the head, but when my earlobes and part of my ear opening are out there exposed, as well as all of my jaw and chin, I am just not comfortable at all. I love my Sly's, but I know for some folks, they get too warm, as well as people have an issue with the ear foam. I know that Sly now makes them with a large hole in the ear foam for where your ear opening is, but not everyone likes them.
Basically, if they both fit well enough, you just have to decide if you want less or more mask. Do you want to cover more of your face and ears, or less?