In my opinion it would probably be using Qubes certified hardware with Qubes on it and then routing everything through whonix VM.
Curious to know if anyone has anything else that is more secure than Qubes - I mean like does anyone know what darknet vendors use opsec wise?
Also I heard Snowden used Tails OS when blowing the whistle - so perhaps using tails would be up there.
Yeah, I guess the most secure you can really get is having a device that has literally no networking capabilities.
Although that isn’t fool proof, just look at stuxnet