World Composition on terrain 5x5km - worth?

Hello

I’m not sure what direction I should choose. I have few test terrains, all not bigger than 25km2. Landscape works not bad, however I have not all terrain designed, just firsts tests with foliage, some architecture and simple level streaming.

Before serious level work I have to decide - should I work with World Composition or not? I see some pros and cons and probably more start work, but most important is final effect and optimization.

World will be not really big, but I have plan to use a lot of foliage and POI’s.

Any help appreciated!

Thank’s