What do you order?

I think most people get graduated by default. Not many order no graduation. I think when you order no graduation all it means is a thicker hairline without a staggered appearance. Or no difference in density through the hairline. I would just get the standard graduated hairline. The only thing is tho. Depending on the person ventilating the unit will reflect the type of graduation you might get. I have gotten pieces that had more of a graduation than others. If it is an important concern than i guess you could specify , or show a picture of the type of hairline you want ventilated. etc

I'm not a wearer (yet), but I think it would be silly NOT to get a graduated hairline - you don't want to draw people's appearence to your hair, and having an abnormally thick hairline will do this, even on a subconsious level.