BAT solid state or tube?

I've got a BAT VK-500, and am considering switching to a VK-60, -75 or -75se.

I have no chance to listen to a BAT tubed amp. I've read the posts but don't recall seeing much in the way of comparison of BAT's solid state amps to their tubed ones.

I'd appreciate any comparisons based on your experience.

PS, other equipment is BAT VK-D5se and VK-5i, Piega P-10 ribbon hybrid speakers (with sub).