As a hobbyist I found Unreal to be far better than Unity. The technical debt that Unity has continued to accrue starts impacting you even as a casual user. It's a bit of a mess to be honest.

Unreal on the other hand has a very solid architecture and goes out of its way to be reliable and maintainable. Plus you have the full source available in your project to search through if you want to dig into the code. The code is generally well written enough that you can use the source code over documentation if you prefer. Blueprints are also great if you are prototyping things.

Also if you are interested in doing networked multiplayer, there is no comparison. Unreal's networking is fantastic, while Unity doesn't really have networking built in.