Actually, dark themes are really bad eye ergonomics. Just look at those read lines on the dark/black background. And no, this isn't optional, it is science. And if you are thinking a light theme is to strong, you can turn down the screen a notch, or use a theme that isn't blending white. And on topic, I think the Unity is ok. But I think GNOME looks like it is a better desktop environment. And yes, DTE:s are just a opinion thing.
