They are different things. Raspberry PI is a computer, arduino is just a microcontroller with peripherals as facilities. Raspberry runs an Operational System inside, Arduino doesn’t. Raspberry has a digital-only set of electrical interfaces. Arduino has both analog and digital.
Depend on the project needs one or other is more suitable. Since IoT have infinite scenarios of applications, each one with its requirements and features, in general it is impossible to define what is better for IoT.
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solved what is the best scenario for implement detection of empty space to park cars in the parking lot? [closed]