Not all yogurt shops are created equal.
I think they were the first yogurt shop in the area, and I remember really liking it. I don't know if they changed the recipe or if the others have a better product, but yogurtini is not my first choice for yogurt around ASU. Theirs is icy and very artificial tasting. And the mochi is tough and weirdly textured.
My favorite for taste is Bliss on Mill and 6th. For self serve, I prefer Yogurtland. Their yogurt tastes better, and there more flavors in both yogurt and toppings.