I use max for architectural work, but I have also been trying to teach myself Rhino 4.0. I know some architectural offices are beginning to use this it now. You can actually download a time unlimited copy to try out from their website (you are limited to 25 saves though).
GMax is Max 4 considerably “cut down”, much of the “good stuff” in current versions of Max simply does not exist in GMax. That said, it’s a great way to learn the basics for free, but don’t expect too much from it.
Max 4.2 through 2014, Composite 2014.
nVidia 9800GTX+ (512MB) (Driver 314.22).
i5-3570K @ 4.4GHz, 8Gb Ram, DX9.0c.