Depends on the level of abstraction you and your kid are willing to get into. Arduino's are lower-level C/C++ which may be a little more complex than CP, but h

Depends on the level of abstraction you and your kid are willing to get into. Arduino's are lower-level C/C++ which may be a little more complex than CP, but have much broader library support (better intro to EE/embedded). RPis are much higher level which could be programmed in any language (better intro to CS/Linux).