[tyhoff]

You speak of such truths :D. It's a seriously under-documented knowledge gap on the Internet. There are an infinite number of Cortex-M4 MCU's but only a few I would recommend hardware companies actually use, primarily due to power consumption of production work-loads (sleeping and deep sleep) and the software packages that are bundled, both of which are generally not assessed before choosing hardware.

[MrBuddyCasino]

Curious, which ones are good & which ones are bad?

[the__alchemist]

Any STM32 L series or nRF can do very low power draw if used correctly. Gotchas include making sure other components on your board aren't drawing power.