I was looking for a terrain software to buy and i had almost made up my mind between World Machine and World Creator when i discovered that Dax Phandi, the founder of QuadSpinner and creator of GeoGlyph ( plugin for World Machine that add a lot of cool stuff ), made it's own stand alone terrain generation software ( well with his team ), Gaea:
http://quadspinner.com/gaea/From what i read it combines proceduralism and layers to give the user the possiblity to choose between this 2 workflows and has a lot of cool features like "Directed Erosion", "Non uniform stratification with plate-breakage" and use both the cpu and gpu to visualize terrains in real time even at 2048x2048 ( 8 milion polys ) resolution.
I think that the price is very good compared to World Creator or World Machine, for 99 $ ( 84 $ currently ) you can buy the indie version that has all the features except for the scripting support, tiled build support and resolution cap at 4k or for 199 $ ( 169 $ currently ) you can buy the professional version that doesn't have any limit:
http://quadspinner.com/Gaea/OrderAlso it's perpetual only so that's a plus for me.
It is in early access and should be published around the end of june i think.
Some other images with the node based workflow here:
https://www.artstation.com/artwork/nnErOThere are also a bunch of videos on youtube of the early access build that show the process of creating various type of terrains.
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So in my opinion is worth it but it's not fast as World Creator because Gaea is mostly CPU based + GPU for some nodes where instead World Creator is fully GPU based and it's way faster if you have a good GPU.
I didn't try World Creator a lot so i can't say much about it but if you are looking for speed than World Creator is better.
There is also Houdini that is good.
If you encounter some bugs i advise you to send an email to their support on the official site, they usually listen to customers problem.
I don't use Erosion Studio but when you create a terrain in Gaea you can choose the elevation of the terrain and scale it as you want, maybe there is a similar option in Erosion Studio.
The official documentation should be completed for this month I believe.
Although Gaea is quiete intuitive coming from world machine so in my case I didn't feel the need to follow tutorials to learn it but the documentation is a must.