in general world creator is a fine app with plenty of tutorials and active support and AFAIK probably the lowest learning curve for terrain generators.
But there is tons of options and each one brings its own pros and cons. World Machine has more flexibility especially when it comes to tiled worlds, though if 4x4km is you limit that wont play into effect.
Really depends on your project and teams specifics.
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Can you say more about project specifics?
in general world creator is a fine app with plenty of tutorials and active support and AFAIK probably the lowest learning curve for terrain generators.
But there is tons of options and each one brings its own pros and cons. World Machine has more flexibility especially when it comes to tiled worlds, though if 4x4km is you limit that wont play into effect.
Really depends on your project and teams specifics.