[tom9729]

Personally as a beginner it's nice to have GDScript built-in. You can literally install Godot as a single executable and everything is self contained which vastly simplifies getting started versus Unreal where you have to install Visual Studio. (I have no experience with Unity but I'm assuming you similarly have to install some C# dependencies.)

Their motivations in creating GDScript are explained here: https://docs.godotengine.org/en/stable/about/faq.html#what-w...

As a programming language it's pretty reasonable. The built-in editor has auto completion and documentation, you can resume from errors. The syntax is basically Python with optional type annotations. Comparing the Godot vs C# examples in the documentation makes me shudder at how much more verbose C# is in comparison.

As others have pointed out you can use C# if you want to. They provide a separate download for it.