What is your personal preferences when it comes to sound..Luxman has a neutral tone whereas Accuphase has warmer sound. I auditioned both and preferred Accuphase. Another huge distinction for me was class A/B vs pure class A…E-650 is pure class A, it’s a sweet sounding integrated. If you gravitate towards, organic, slightly warm and SET sound then Accuphase is worth every penny.
And 2nd the recommendation for Pass Int over Luxman if you can afford Accuphase.