I have auditioned both, Luxman and Accuphase. Luxman is nice but lacks the warmth Accuphase possess in spades. I was immediately drawn to Accuphase’s refined and luxurious midrange. To my ears, Accuphase is very polished in its presentation, more “musical” in a romantic classic sense. SET like harmonics without the hassle of tubes.
Luxman offers comparable build and pedigree, with sound leaning towards balanced, slightly more energetic or punchy in some cases.
A-48S + C-2300 is a dream pairing. The refinement of Class A in the power stage married to the musical elegance of the pre makes for one of those “buy it and stop thinking about gear” setups, IMHO.

