What is the best Linux distrib to run Armory and other 3D applications, the better for 3D ?
I don’t really have much of an idea, but Ubuntu has a flavor called Ubuntu Studio that comes setup with creative tools and some small optimizations like a low-latency version of the Linux kernel. Other than the kernel I’m not sure if it really does much else other than install extra software for audio/image/video development, etc. You might want to look at it.
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Ubuntu or Xubuntu.
I like Xubuntu because of the Xfce desktop environment and don’t like Ubuntu because of the Unity desktop environment.
https://xubuntu.org/
Video 18.4 release: https://www.youtube.com/watch?v=7ZM5PZbb2-g
THX 
Do you mean in regards to GPU performance?
Ubuntu or Linux Mint are generally the simplest in regards to avoiding any terminal commands and using a GUI to make changes and add drivers, software but that’s nothing to do with 3D.
Arch/Manjaro and Fedora have more updates, faster to receive minor improvements.