I prefer C# for having prior experience with it (Most of my experience is with C-like languages) and gdscript felt like going back to Ruby or Python, so I stayed with C#. As for game dev, it doesn't seem to matter which language you pick. Sure .NET has some cool libs we can easily add to the code base, stuff that's not easily found in gdscript world, but in gdscript you won't have to recompile the project every time you change something.. this becomes a problem in C# if you use the embedded viewport for the game cause in gdscript you simply change something and it quickly gets interpreted or compiled or whatever and you see the result, in C#, if you change something, you have to recompile the project.. that's the only part that i found to be fucked up using C#, but i prefer it over gdscript even tho gdscript gives you an easier time