Two things:
1) Very few posters in this thread have had Luxman and Pass amps in their systems at the same time. Our aural memory is shockingly short - some studies suggest as short as 15 seconds.
2) Opinions are all over the map.
When you are spending serious dollars on equipment, you need to listen for yourself, ideally comparing both brands in your system. Not always easy to do though.
One thing worth noting is that Pass integrateds are bare bones affairs. Luxman’s feature set is better. Plus they look nicer IMHO.
FWIW, I have no Luxman experience in my system. I own a Pass Labs XA30.5, driving high efficiency open baffle speakers (Spatial Audio M3 Sapphires). I enjoy this pairing so much that I would only move up the Pass Class A line, most likely just to the XA30.8. Incredible detail and a very nimble, delicate presentation (not sure why some say these Class A amps are “dark” or “slow”.)