I decided to create a simple main menu and do two implementations: one in Godot, and one in Unity. It allowed me to experience both engines on a level playing field, and I hope that in later projects this will let me decide between engines easier.

Below is my Unity implementation, I initially created a UI Toolkit version but eventually decided on the legacy UI system due to it being easier to implement shaders into. I created the dissolve shader using Shadergraph but in hindsight it would have been easier to use HLSL.

Below is my Godot implementation, I think that the default Godot noise texture looks better in this case than the gradient noise in Unity's Shadergraph. I wrote the dissolve/ember shader in GLSL.

I'm currently working on an Unreal 5 implementation of the same menu concept.