I'm most interested in Godot right now because it seems to have about the same functionality and generally the same style of usability as Unity, which I was using previously, and it's open source (besides being free, it means I have the option of going into the code to figure out what's going on and even fixing it, whereas if there was some bug or mystery with Unity, I was at the mercy of their support).
Also the Godot doc is pretty good - one reason I started using Unity over ten years ago was because I could read through the doc (the manual and scripting reference) and understand basically how everything worked, not just infer it from tutorials, and similar with Godot. I recommend taking a pass through their doc and see if you find it accessible and if you like their approach. https://docs.godotengine.org/en/stable/