Sure, it isn't such a big deal when you're just starting out as most professionals and experienced users recommend the Arduino Uno. However ... its considerably big size at 68.6 x 53.4 mm.

The Arduino Team presented ... has been added to the UNO for more stable mounting. The booloader is now the Optiboot bootloader. The boards can run firmata out of the box. We are not sure about ...

“Uno R4 WiFi includes an error-catching mechanism that detects run-time crashes and provides detailed explanations and hints about the code line causing the crash,” according to Arduino – Electronics ...