Following the Good Lunches in Mountain View thread, I noticed that a few ppl mentioned La Costena and La Bamba. I know that La Costena always gets these "Best Burrito in Mountain View" awards, but I've never been that impressed with the burritos there. That said, I've never had their carne asada burrito which is supposed to be the most superb one. But I LOVE La Bamba burritos (grilled chicken is fantastic). Has anyone had extensive experience tasting all the varieties and comparing the two fine establishments? I hope to get some tasting done this weekend.