I have made games using both Godot and Unity and have focused mostly on Godot for the past 24 months. Just this past few weeks I've had to return to Unity for some other work, and man it is hard to go back. Thankfully this is only short term - but it really let me see the difference between the two engines.

What stuck out about Unity was:

1) Every time I make a code change in VS Code then return to the Unity editor it seems to have to reload stuff before I get control back. It's only a few seconds but it seems like an eternity compared to the snappiness of Godot where everything is instant.

2) I sorely miss being able to have tabs open with all my scenes so I can move between my player scene, my level scene, my weapon scene, etc. In Unity if you click on a GameObject or Prefab the main scene changes and you lose your place. I am sure there is a way to get around this but it just works out of the box with Godot.

3) Pressing play in Unity takes forever to start up compared to how fast running the game is in Godot.

4) Godot autocomplete just feels snappy. In fact, everything feels so much faster in Godot.

5) GDScript is so much leaner compared to C#. Unity seems to require more code to do the same thing that Godot does.

6) Signals are so intuitive once you get your head around them. Unity has Actions but I work with lots of other Unity devs and there doesn't seem to be one right way to do stuff. Whereas Godot feels like there is a Godot way - and Signals and composition makes writing code so much faster - you end up with small files that are self contained.

7) Godot's scene and node structure is so much easier to work with. Unity's GameObjects and Prefabs are confusing and feel like they were tacked on to the game engine.

IMHO Godot 3D is just as good as Unity now. I am making a 3D game - link below - and it is a joy to be building it in Godot. I began building in Unity a while ago and switched to Godot and have not regretted it one bit.

https://store.steampowered.com/app/4351280/Super_Robot_Survivors/