Which 3D Cad Program is the best?

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What criteria defines "the best"?
No CAD software is good at every task, and other factors like price, and/or support may factor into the equation as well.
If additional details are provided, it may be possible to suggest some different programs.

The best software is the one that will allow you to work long term professionally in an area that you like. What good is learning software like Catia if you do not use it? Also, it is usually the software that governments subsidize in design and engineering schools that are popular.

Le meilleur logiciel est celui qui vous permettra de travailler à long terme professionnellement dans un domaine que vous aimez. À quoi bon apprendre un logiciel comme Catia si on utilise pas ? Aussi, ce sont généralement les logiciels que les gouvernements subventionnent dans les écoles de dessin et d'ingénierie qui ont la cote.

There isn't such thing as the best CAD software, but there is the best in the (x) field...

For example:
SolidWorks - which I use - is perfect for mechanical and product designing.
Cinema4D is perfect for animations and motion graphics.
Blender is for free.

Think of what you want to do with the software, then consider the money you can spend on it.

You can check this website, too...
It contains many comparisons between the most popular CAD softwares.
https://www.redstackshop.com.au/blog/category/software-comparison

BTW, Copy/Paste is extremely useful...
https://grabcad.com/questions/which-cad-software-is-the-best