The PCB Artists ESP-PROG is a USB programmer for ESP32 and ESP8266 with USB-UART converter and auto programming hardware built into it.
The programmer also features a pin configuration matrix that allows you to connect any pin of the programmer to any functionality.
While this seems like a minor advantage over other programmers, the best part of using our programmer is that you can use robust JST connectors to connect to this programmer. Dupont wires go loose often and cause frequent failures or corruption when uploading your firmware, thus wasting your time.
Also, you no longer need several programmer to hook up to different boards. All you need is one programmer that connector to everything – and quickly!
We at PCB Artists use this a lot when we work with prototypes based on ESP32 and ESP8266.