Wow what a Bunch of GOOD STUFF!. I own an STM32 Eval kit (bought it for $14.+ from Newark at the same time I paid for my Raspberry Pi) and frankly it scared the Hell out of me. I am comfortable with ANY phase of electronics but know perhaps enough to engrave legibly on the head of a small pin, my total knowledge of 'C' and reading this thread has caused me to want to re-evaluate that board... Just as soon as I can find time... or a roundtoit... either one will work just fine... IMO...
Doc