"I have the heretic idea to use polygon modeler for my concept studies and I picked Modo for that."

If Modo gives you the desired results then that is the program you should use.

But if UI aesthetics are strongly driving your decision on which program to use, I find that very strange.

My priorities on choosing a software tool (in order) are:

1. Does it produce the results I need?

2. Does it interface and play well with other programs I use? Is the software stable and reliable?

3. Is timely support and documentation available? Is there a user community?

4. Is the company viable, responsive, and continuously improving the product?

5. Is it easy to learn and use?

6. Cost.
.
.

10. Aesthetics ( way down on the list )