Milpitas Square is hard to beat. Not only a wide variety of Chinese places including Darda and QQ but Anjappar Chettinad. I worked near Cupertino Village for a year, went to all the Chinese places there and wasn’t wildly impressed.
Newark, Fremont, and Milpitas run into each other. I think there are livelier Chinese and Indian restaurant scenes there because it’s not as expensive to open a place as it is around Sunnyvale. The downside is as soon as you find a place it might be replaced by something else, like my favorite Shanghai place did.