I just got the vk-75se (which is supposed to have better bass than vk-75) and I have no experience with the Pass, so maybe this comment isn't relevant.
Two major points about the 75se: astonishingly powerful bass (I unhooked the subwoofer and won't put it back) and how loud it plays (100+ dB with the VK-5i knob at 55, and Piega P-10s hooked to the 4/6 ohm tap).
FYI, another current thread in the amp/pream section compares BAT ss and tubes.
Good luck.