Well, I say ESP8266. In fact this one uses the ESP8285, which is basically an ESP8266 with 1MB of flash built in, so no need for an external flash chip. That makes it even cheaper to manufacture, and hence for you and I to buy.
Store Closing for Holiday
Our store will be closed from September 20th to 27th for a well-earned holiday. You will still be able to place orders during this time but they will not be fulfilled until after 27th.