It really depends what you hope to achieve. I've dabbled with Arduino and coding it isn't difficult; but dealing with serial port connectivity issues can be frustrating and it also helps to have a reasonable understanding of electronics.
I haven't tried Raspberry Pi but the impression I have is that Arduino is much more low level and that RP is more appropriate for 'always connected' IoT devices.
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It really depends what you hope to achieve. I've dabbled with Arduino and coding it isn't difficult; but dealing with serial port connectivity issues can be frustrating and it also helps to have a reasonable understanding of electronics.
I haven't tried Raspberry Pi but the impression I have is that Arduino is much more low level and that RP is more appropriate for 'always connected' IoT devices.