New to 3D printing. Solidworks or Autocad for design?

[curious aardvark]

now are you talking freeware in general or just cad software.
Because a linux based computer is always going to be better than an apple os based machine, and all the software is free :-)
Given that people are getting used to different interfaces through tablets and smart phones, I'm surprised that more people aren't using linux machines. But that's mainly down to how computers and software are sold. And for that we can blame bill 'the bastard' gates.

And what criteria are you using to define limitations ?
And is there ANY commercial cad software out there that is even remotely similiar to openscad ?

And as cad means: computer aided design.
Then any piece of software that helps with design is cad - 123dcatch definitely fits the description :-)

The other thing to bear in mind is that different pieces of software will be better for different things and different people will use them in different ways. A lot of a persons experience with software is entirely subjective.