For web export you can use GDScript (the built-in scriping) or C# with Godot 3.x (i’ve never used godot-rust)
Viewing post in Recoil Reach jam comments
Me personally I enjoy having the static typing of c# and being able to use a language outside the engine. Plus having access to the latest 3d features for godot is nice. I will probably switch to rust gdextension until the c# web build is ready. If I decide to work with a team at some point I will have to bite the bullet and use gdscript.
Plus I use neovim so setting up gdscript will be a pain :p