Agreed. Also you should be using PBR instead of Diffuse/Spec/Normal. So that would be Albedo/Roughness/Metallic in Unreal. https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/PhysicallyBased/ We have some good resources about PBR here on our wiki http://wiki.polycount.com/wiki/PBR
Thanks guys, that's a big help actually. I guess with UDK for some reason I wasn't sure if bringing in outside models was possible, but I think it was just the file type I was using at the time. I may stick with Unreal since I'm familiar with UDK, but definitely going to check Marmoset out as well. Also, thanks on the PBR…