I've been doing Arduino things for the past dozen years or so, and I was a huge supporter of the Arduino organization, and I still use the Arduino IDE, but I've mostly moved away from their boards in the past five years. I've used a lot of Teensy boards over the years (hundreds, actually) and the occasional UNO, Nano, and Micro, but the Raspberry Pi Pico has been my go-to board in the past few years, and I work in education where the micro:bit seems to really be taking off. It's a shame, because I'd love to see Arduino continue, but not as a closed-source company.