Raspberry PI is a little different beast from Arduino and ESP32. It is a full blown computer, with Linux at its core and with 4 USB ports and display port. It is a very versatile and efficient device with a tiny footprint for such a powerful computer.
Raspberry Pi (/paɪ/) is a series of small single-board computers (SBCs) developed in the United Kingdom by the Raspberry Pi Foundation in association with Broadcom. The Raspberry Pi project originally leaned towards the promotion of teaching basic computer science in schools and in developing countries. The original model became more popular than anticipated, selling outside its target market for uses such as robotics. It is widely used in many areas, such as for weather monitoring, because of its low cost, modularity, and open design. It is typically used by computer and electronic hobbyists, due to its adoption of HDMI and USB devices.Wikipedia
Raspberries are used in an amazing variety of projects. In fact, its capabilities far outshine ESP32 or Arduino, but on the other hand, it is overkill for some projects. But as always, the project comes first, and the tools for making it into reality are selected by the needs of the project.
Raspberries come in a vast array of different models, but the PI3 shown above is the most widely used version. It has a MicroSD reader on the bottom, so it can be given the appropriate capacity of memory. Raspberries are easy to connect to the Internet, so they are ideal for IoT projects.
Tom’s Hardware has this comparison table of Raspberries:
As always, we are keen to learn of your IoT needs, so we can assist you in solving them.