I know a lot of indie game developers that use Unity, and not having access to the source code to understand why something isn't working as expected is a very common complaint. Being able to dive into the code you're building on top of is a super power.
AFAIK, Unity-the-engine still has a vsync bug edit: on Linux that makes running unity games on my laptop burn one of my CPUs at 100% nonstop. It heats the thing up, burns precious battery life, and is doubly infuriating if you're playing a game that should be light on resources, like TIS-100.
This has been an issue for years, and they can't be bothered to fix it.
edit: the reason is obviously that Linux is a small customer base, and you'd only notice this on Linux laptops, which is an even smaller subset. However, for indy developers in niche genres (where in some cases, like TIS-100 for example, you can expect a more significant chunk of Linux users), I think the fact that Linux support supposedly comes for free is one of the reasons to use Unity, making this doubly cynical.
UE4 is massive and overkill for 2D games or low-poly 3D, especially if you intend to release on mobile (which Godot is designed to do well). It really depends on what you are trying to do.
