Arduino
STOP USING BRAND NAMES, I am TIRED of seeing it.
It's not "Arduino", it's "microcontroller". STM32 "blue pill" compatible clones are cheap enough to give away in bulk. You don't even have to consider going 8 bit anymore.
It's not "Raspberry Pi", it's "single board computer". Although dtb overlays and such are slightly more annoying on other boards, there's literally not much of any difference functionality wise. AND the other boards are cheaper.
There's no reason to use the big brands. Unless you are working for someone and your boss demands "enterprise support" Red Hat style, of course.