My process has been a long one, but I test a lot of stuff.......because I enjoy it, and because it helps to narrow down my choices. There are many arrows out there that will "work", it just depends on what your goals are, what you're willing to put up with, and how much of a perfectionist you are. Over the years I haven't found a standard diameter arrow that will meet my durability expectations. I also can't stand outserts and haven't found enough benefit to using micro arrows, so I have settled on .204" ID arrows. These smaller diameter arrows have a thicker wall than standard diameter and tend to hold up better on hard hits and angles, etc.....i.e. less likely to be damaged. But that's not always the case. That's where a lot of the testing comes in. Some .204" arrows seem to break as much as the thinner-walled standard arrows.
So obviously durability is high on my list. I know of no other way to figure that out other than testing. That testing may just involve a week of abusing the arrows compared to others, or it may be actual use over the course of several months or years. Either way, I have a pretty good idea how they will perform for me.
But having the most durable arrows in existence doesn't mean squat to me if they won't shoot worth a darn. So precision is actually my number 1 requirement. I shoot a longer draw and higher draw weight so I generally need a stiffer spine. I shoot a long arrow at 30" carbon to carbon, so I want the straightest I can get. But also, with the straightest you generally get the tightest spine tolerances as well. When you have the best spine for your setup and the most consistent, tightest arrow tolerances, and both ends are squared perfectly, then you'll generally have better shooting arrows. But it also makes no sense to put crooked or bent components on those arrows, or components that easily bend or break.
Part of the process of choosing arrows is also choosing those "end" components. Makes no sense to have super accurate and durable arrows, if you're going to throw on some cheap aluminum outsert or halfout. They WILL bend....or break. Sometimes the bend is impossible to see......until you put them on an arrow spinner. And then the end of the arrow wobbles......ruining the consistency that we strive so hard for. I've also bent SS outserts/halfouts.
Part of the arrow selection and component process is determining what your goal is for an end arrow weight. My goal is always somewhere around 500gr, but may be 20gr above or below that depending on the GPI of the shafts and my insert weight. So I always take into consideration the GPI for arrow length, insert weight, and other component weights (nocks, fletching) to get close to my end weight goal.
But as for the arrows themselves, this pretty much sums up my process and thinking in choosing the right shafts. And whatever arrows I put together for the quiver every year, I'm 100% confident that they'll do their job if I do mine. I use the same arrows and setup for all species. These are my processes to meet my expectations and goals. Your goals and expectations may differ.