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Raspberry Pi Pico 2, our new $5 microcontroller board, on sale now
(www.raspberrypi.com)
This is a most excellent place for technology news and articles.
I would say the documentation is more thorough, and at least for the non-wireless versions, there are no mysterious code blobs. The source code to everything including the ROM boot loader is online. The Pico boards also have a nice voltage regulation system so you can run them on a wide range of supply voltages.