Fish, without a doubt.

Thanks for the explanation, I understand now your point of view. It sums up on which layer we consider then. BTW qubes is a fantastic OS if you want isolation of information or privacy. One VM could serve for work, another for browsing, and eventually for privacy. Take care !

Honnest question: why is it Linux? I can’t find relevant information on the matter. Every source point the fact that it’s a bare metal hypervisor therefore not Linux but that’s all. Could you enlighten me on the matter? Thanks in advance.

Qubes

Classic mistake :)