They're being used in a domestic system. As for preference, I have a very slight preference towards the LIO-8 because I love total neutrality and it's the most neutral sounding dac I've heard and imo, I feel the LIO-8 is more neutral than the Weiss dac202.
I love both the LIO-8 and invicta and admired each for its own strengths. That's why I'm keeping them both for now. People that use headphones for the majority of the time, I would go with the Invicta simply because I feel that the integrated headphone amplifier is phenomenal and that it paired really well with all kinds of headphones. It's a powerful and high quality headphone amp. The headphone amp of the LIO-8 is phenomenal as well if you're using it with low impedance headphones but it struggles with high impedance headphones such as the Sennheisers HD650 or HD800.