ESP32 vs STM32: Which one is better (Bluepill)?

Many commenters tell me that the STM32 MCUs are great. The last time they were used on this channel was in video #11 on Jul 27, 2015. High time for a closer look. I am a proud Patreon of GreatScott!, Electroboom, Electronoobs, EEVblog, and others. Links: Bluepill: or or or Maple Mini: ESP32 Mini: or STLink V2: h