I could say I have as of late become "persnickety" about my yarn choices, or what is otherwise known as a "yarn snob". I've become very picky about which yarns I want to use or even buy lately.
This has come about after discovering that a yarn I thought I would like that I got at Michael's, LionsBrand Vanna's Choice, was actually not what I liked... it was itchy to work with and made my head itch when I wore the hat I made with it. I also found that I prefered Wool Ease Chunky as opposed to regular Wool Ease for the same reason, it was less scratchy.
I have discovered that there are very few 100% acrylic yarns that I even like anymore, pretty much limiting to Caron's Simply Soft. There are probably others that I may like, but I'm not totally fond of Red Heart for certain.
I make my choice based more on comfort with knitting. If it makes me itch, then I really don't want anything to do with it. I don't really care if it pills a little. It has to be comfortable to knit with, because if it isn't, it won't be comfortable to wear.
I have some patterns I have tried out and am ready to review soon, hopefully once I get around to getting the pictures online, I will post them up here.