If you don't have a modeling program yet it doesn't hurt to have a look at Hexagon. It can do some pretty nice thing, even if the toolset hasn't changed much in the last couple of years. At least there was a bugfix not too long ago. I prefer Silo and ZBrush, but both are far from being free. 

I cannot say much about Bryce, since I use Vue. At the moment I see no reason to change. And that's true with Studio too. Most of my content is for Poser. I used the advanced Morph Loader with DS3, but since Colorcurvature published PML, I don't need it any more. And my shaders, my lights and lots of the clothes (dynamic) are Poser only. Change for what, for Genesis? Not really. 

GoZ is nice, but I can bring my stuff to ZBrush with PML as well.

Since I'm Mod for D|S as well, I've got my copy. Might be handy to try out things when people have problems with the software, but I won't even link all of my runtimes to Studio. 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.