Flipper Zero is a set of hardware and software extensions built for a tiny ARM computer Raspberry Pi Zero W. The software is made in form of packages for the official Kali Linux ARM, which is loaded from the SD card and contains all the usual opensource tools by default.
Before building Flipper Zero, we checked many boards, such as NanoPi Duo2, Banana Pi M2 Zero, Orange Pi Zero, Omega2, but the Raspberry Pi came up best, it has a large and active community around it and is well tested and documented.
Key benefits of Raspberry Pi:
• Built-in WiFi with monitor mode and injection support (with nexmon patches), works with aircrack-ng, reaver, wifite, etc.
• Built-in Bluetooth 4.0
• Quite good PCB 2.4GHz antenna
• Supported by Kali Linux and many pentesting tools like P4wnP1 A.L.O.A.
• Easy swappable SD card for data exchange and updating
Raspberry Pi is not perfect and has a number of disadvantages, such as high power consumption, no sleep mode, not open hardware, etc. But if you evaluate the general pros and cons, then this is the best option. If you have something to say about this, we suggest discussing this on the forum