I prefer the old hair. Plain, but also makes sense for her personality. Besides the new hair makes her look more boyish and she's already short and flatchested.
Zenom said: I say we don't need to argue which hair is cuter or better and let's just use what we prefer. I say both hairstyle looks nice.
This, people. It's just a hairstyle change. Please, for the love of whatever deity you pray to, don't start a flame war or make a "We hate new hair!" club because ZUN decided to change his character a little.
I don't really mind, though I gotta say I do prefer the old one. But a change in a hairstyle (or any part of her design for that matter) is actually a good thing to happen to a Touhou character because that brings even more sources of ideas for derivative works. I quite like Marisa in that sense because her dress has been changing ever since Mountain of Faith (including Wild and Horned Hermit), giving her a huge lot of variety.
>Sakuya's eye's changing from red to blue >Reimu's constant outfit and body changes >Marisa's hair color change and constant outfit change >Yuuka gaining a skirt. >Yukari changing outfits from a western style to an eastern style
And now this. We must learn, people. In Gensokyo, the appearance of the physical body is never absolute. Neither is the physical form of a Ghost.
Youmu's hair style in Ten Desires seems to me more like bed hair than a new hair style, as if she didn't waste time combing her hair before putting the ribbon in and setting out. The game does take place in the early morning hours, after all, and in all likelihood Youmu felt it more important to get rid of the spirit-like non-ghosts in the Netherworld than to fix her hair all fancy-like as if she was going to the Human Village to buy a week's worth of food for Yuyuko's lunch.