You need to look more closely at both of them. I think you will find a considerable weight difference. I can't speak directly to the Icon, but I have handled a few ventures, and they are a fair bit heavier then the x-bolt. I also read a review on the venture, and it had feeding problems, not saying this is the case with the icon, but something to consider. They are both accurate rifles from what I've heard, and seen.
Am I biased yes, but that's the input I think you are looking for. I've got a 300wsm in an x-bolt, shoots pretty consistent 3/4 moa, and often better, "very" light rifle, in fact lighter on my scale then my Rem mountain rifle in 270. Those fat stubby rounds feed like butter out of that rotary mag. I'm very impressed with the rifle, but like I said go put your hands on both of them, and I think you will know which one you will want, good luck.