In jPCT you have much more control over whole rendering process. You can do whatever you want, but it takes much more time than Unity. Export scene from Blender or 3D Studio Max is very simple. Just export it into OBJ or 3DS file format.
Unity is something like frontpage. Do not care about the background process, it somehow works (or not). You can do good looking scene very easily and quick. Unity is full of bugs. If something does not work, the most time it is repaired by closing and opening the unity. I created scene in Unity 5.1 but after update to version 5.3 is whole scene gone. Nothing helped.
This is what I did in this engine.
http://www.jpct.net/forum2/index.php/topic,2926.0.html