Unitiy's main strengths are it's asset store and ability to export to consoles/phones, also most people like C#. It also had strong momentum of tutorials and community but that is diminishing now as most are so outdated now and for older versions that they are no longer relevant. Unreal is getting easier everyday and they are getting more assets and more community together so it's eating them from the high end while Godot is eating them from the low end. Since DragonRuby is good at exporting to consoles and most Ruby users like Ruby so it's arguable that they could be better in a lot of ways.