I've heard it from Unity expert themselves telling you can achieve the same quality (that's why I've included the performance and graphic comparison).

One thing that maybe the "poisoning the well" element is the fact Unity had a generous freemium open doors for hobby developers, which means there's tons of project that are meh while Unreal Engine is well used in creation of AAA games.

Have you tried them both? Is Unreal really that much better for rendering?

The way I've heard it is that Unreal has better defaults in it's rendering pipeline, producing a slightly more "professional" look despite a lack of ability. Having said that, I was unable to wrap my head around Unreal to make a toy project with it, but even the demo project it has looks better than my game in Unity

I have an idea for a game, but it has rather complex mechanics and physics. Would you recommend Unreal just in general? Is there a use case beyond hobby size projects that you might recommend Unity?