I dunno. I've been shooting Axis shafts for more than a half-dozen years now and find them very tough and durable. Regardless, lots of good carbon shafts available. I don't think it makes a heck of a lot of difference what you end up choosing. Is a good idea to stay with one brand/size though to avoid ending up with a lot of mismatched components.
hold a standard diameter arrow in your palm on a windy day and then hold a skinny arrow in your palm. the standard diameter is much more affected by the wind (of course smaller feathers help too).I have also found the small diameter arrows allow me to use a bit stiffer spine and get good results tuning---the smaller diameter places the center of the shaft closer to the riser. I only draw 26" and shoot bows in the low 40s so this has been a positive thing for me.I have yet to find a downside to them.