I don't know if this is completely appropriate, but considering the range of options.
I primarily use Daz Studio with Iray renderer, and am wondering how easily stuff can be moved between it and Terragen. (I don't own Terragen yet, but plan on buying it at the end of the month, for HDRI IBL if nothing else)
I realize stuff can be transferred as Obj, but there's a lot of shading that I'm likely to lose.
Iray shaders cover stuff like subsurface scattering, translucence, light-emitting surfaces, displacement, and so on.
Now, I expect that that stuff won't auto translate, but how much of it can be replicated in Terragen?
How about Genesis figures? Only when converted to Obj?