I would go for Silo. Support will be there in the long term. Hes is a godo idea and if were still in tehhands of Eovia it would be a godo choice but it is not. I think Hex has  afew to many keystrokes and bugs in it to interest me anymore. I have both also. (well only a demo of silo) P{ersonally I still like wings better for some reason than either.  Better edge handling and better odd tools . I like hex's renderer a lot I think it is one of the better looking modelers out there as far as screenshots go but that is not what gets work done. Basically hex coudl be good but all the people who wrote the software are fired and noone is working on it now.

 I have AC3D which is cool for some things has a few odd tools that none of the others have and it is cheaper than either. has a nice path extrude and lathe tool plus greeble and hair plug ins available. AC3D can handle a lot more polygons than wings does.

The wit of a misplaced ex-patriot.
I cheated on my metaphysics exam by looking into the soul of the person next to me.