Yes. You got me wrong. Unity can render great terrains and uses lod and streaming. I already mentioned that. I just dont know about indoor scene-management. That is all I said.

I will make some testings soon and will compare different engines with the same indoor geometries and we will see more clearly then.

And I am sure Unity will have the best work-flow and tools of all indie engines. But this is still guessing from my side. I had no chance to test Unity so far. I have to wait.