There is nothing in CGSociety's's Terms and Conditions that forbids discussions about "best software". The ban against "What software should I use", or "App versus App" threads is an invention solely by the leader of the General Discussion forum. In spite of this the "Should I learn 3Ds Max?" thread is happily summing along and no one interfere.

Try to goggle zBrush vs Mudbox and you get dozens of hits in all kinds of forums. (Including CGSociety) There is a great interest in threads like this and understandable so. Life is simply too short to try out all software. The great composer Hugo Alfvén claimed that he had learned orchestartion by listen to people arguing for their instruments.