Hi everyone,
i really need to know, how you guys creat a Map for your Games. Are you creating everything in the UE4 or in your model tools like Blender ?
I use Geoglyph 2.0 with World-Machine 
Geoglyph with World Machine is a great tool, but you need some money to buy it. For the meantime, you can do methods of importing your own heightmaps for instance.
I would suggest sticking with the default tools in UE4 for now, they are quite powerful. Here is a good beginner tutorial to UE4’s Landscape editor.
i wouldnt do it in blender. if you use blender you have to create it first, detail it and when you want to change something, you have to go through the exporting and importing all over again.