As a license holder and an OSX user, T-Splines is one of the last vestiges of Windows for Rhino. Grasshopper not mentioned, it will be cross platform soon ish!
From Wikipedia … T-splines were initially defined in 2003.[6] In 2007 the U.S. patent office granted patent number 7,274,364 for technologies related to T-Splines. T-Splines, Inc. was founded in 2004 to commercialize the technologies and acquired by Autodesk, Inc. in 2011.
I did beta test Fusion 360 starting dec. 2012, but it never worked well with whatever video card was in my old Mac Pro at the time, so I abandoned it. I do remember that the user interface was not all that user friendly coming from Rhino. If I was more familiar with some of the other AutoDesk / AutoCad programs like Rrevitt or Inventor it may have been more helpful.
Being a T-Splines user, i found Clayoo 1 to not be very comparable. I also use RhinGold but I haven’t upgraded since V3, since I never used it much.
This is sort of my direction as well. i have looked at both, but since my Windows box is right behind me, I can just turn around and boot up and use T-Splines for now. Off to look at 3D Coat again. Thanks for mentioning it. zBrush is a learning curve I will take when I have a few spare weeks to devote to it.
What about some sort of Sub-D modelling within Rhino? Isn’t that mentioned for V6?
Not sure I will go the Clayoo route unless it is ported to OSX.