I think it is possible to achieve with almost every engine a good looking outdoor level. The screen shows what i did in 3dgs a while ago.

However to get this environment running i had to implement a complex scene management and it was 2 years try and error to run with a
decent frame rate.

I also struggeled a lot with the 2GB memory barrier. Cause even if you move the same models around (what i did for grass and trees) you
still need a couple of thousands of them to fill a larger level.

In the leadwerks engine i get the same result with a couple of mouse clicks and everything is shadowed and animated...

So in my opinion the engines are designed for different purposes. And if you want to run a state of the art outdoor level i doubt 3dgs is
the right choice.