I am curious what the next thing up is that is more "legit". At this time I've used Arduino/ESP/Teensy. I bought an STM32 and Beaglebone but wondering what does

I am curious what the next thing up is that is more "legit". At this time I've used Arduino/ESP/Teensy. I bought an STM32 and Beaglebone but wondering what does something like a Boston Dynamics dog use? Probably a full on processor like i7. Edit: oh it uses i5 with Ubuntu ha, plus separate graphics for the AI part