I think that arrows do vary allot. I myself am a Carbon Express guy, and always will be!! You have to break down each feature the arrows has to understand what makes one better than another in my eyes. To break down a few of the features and what they do would be…..
Dual Spine Weight Forward = rapid recovery today’s bows are fast!! Meaning allot of arrow flex upon the shot. The dual spine and weight forward helps the arrow recover from that flex faster and allows the arrow to start to spin sooner and leads to better accuracy.
Diamond Weave = The weave is what helps make each arrows spine consistent if your arrows spines are all consistent the more consistent your groups will be.
BuffTuff Plus carbon weave = Is a easy one in my eyes makes them STRONG!!! Last years bow season I used the same Carbon Express arrow on all four deer I shot, yardage ranging from 10 yards to 55 not once did a arrow break or not pass threw.
BullDog nock collar = Saves on arrows when you have knock end impacts.
Them are just a few things that have sold me on CX arrows. Hope it helps you a little bit.