First: Forget the Delux! It's not worth the money!
Second: Forget the Mac Pro V4! It lacks the flexibility of the V3.
I have tested the TC Mac Pro V4 and some tools are nicer to work with, but the most important tool, the explorer tree, is very restricted, compared with the V3.
In V3 you can use the explorer tree and re-design the 3D-shapes, this is impossible for many of the 3D-shapes that you create in V4.
Please download the V4, create some solids and add them together and try to change the dimensions of one of the sub-parts.... This can be done in V3, not in V4!
I like TurboCad V3 and will stick to that.