Best place for (masala) chai latte? NOT FROM A POWDER/MIX - Gross.
I have had great chai lattes and mediocre chai lattes at The Mission. I think it depends on the barista.
Pretty much every other cafe and breakfast restaurant is always a disappointment. Peets is actually the most consistently good I've found (not great).
Despite living super close to Little India I haven't tried masala chai at any restaurants - I think because I usually go for dinner, don't want the caffeine at that hour. Haven't tried Caffe Calabria either (I always get coffee there!).