I don't see any other comments, not sure if it's my instance acting up. But, anyways, I started with godot (I'm still learning myself) and I don't regret it.
At first I felt like I would rather be learning unreal or unity since it would be more useful in the business world, has better graphics and such. But I'm having a blast learning godot and I honestly have high hopes for the future regarding godot. The new demos look amazing and there are some people on YouTube with insane graphic demos on Godot. Really surprising stuff.
Plus, as you said, open source is great. Only downside to godot is that since a major new release came out recently, a lot of the tutorials and guided are a bit outdated. You can still kinda follow along with some basic logic and ingenuity though.
Good luck!