I can't myself comment which is better.  I understand hex has a few additional whistles.  Kixum our forum coordinator models things in Carrara http://www.renderosity.com/homepage.php?page=3&userid=41015 for his gallery.  I have both and am going to be focusing mainly in Carrara.  I also have 3d-coat (sculpting like zbrush but more affordable, has a home version).

That being said, Silo also hasn't had any updates but a number of people like it.  Its on sale directly or through STEAM (steam is cheaper ).