Alberto,
not all tools are the solution to every problem. If you want just to write a few lines of code and run the code then OK. But you have a full featured computer to blink a led or do some other simple tasks.
Maybe I am seeing this from pure economic-technical aspect, but if one wants to do something in big scale, sure cannot rely on such platforms.
As already said, all these are very good to learn to walk. Then, if you feel ready, you have to run to compete others and these platforms (arduino, raspberry etc) are not the right shoes for it.
Ioannis
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