I like Wildberry but it's kinda like McDonald's - tastes good and consistent most places you go, but (a) the quality is not the best, and (b) there are always local places that are better. The Mix is another yogurt shop around the corner. Much higher quality/better tasting yogurt IMO and other great treats as well (chocolate, Belgian waffles, and did I say chocolate??). Another option Is Fraiche in Palo Alto. Similar quality to the mix but known mostly to locals.