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Which MCU makers do you prefer?

Atmel (now under Microchip). They have great documentation and software libraries. And they actually acknowledge hardware errata in the documentation.

And they actually acknowledge hardware errata in the documentation.

More so for Microchip than Atmel --- it's pretty common to find on some of their newer and more complex parts a ton of errata, among which there are some extremely "WTF!?" ones like "feature X does not work at all".

Yeah I love those. They highlight features xyz on first page of datasheet. Then on the last few pages its like btw features xyz dont work on rev A-F. And your supplier doesnt know what revs they have...

I used a SAMD21 for my latest project and I was definitely impressed with it versus STM32s.

I will say that STM has definitely released better tools that make it much easier to get designs up and running (STM32Cube specifically).

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