audio research ls3 vs krell kc3

hi can some one tell me a different between audio research ls3 and krell kc3 which one is better sound thank you
I used to have a Krell KRC-3 while my friend had an AR LS-3"B" (Balanced). We both used them in Balanced mode. We both had Krell KSA amps as well as Dunlavy SC-IV speakers.

While both are supposed to be classics and excellent preamps, I preferred his more. I believe it was the tube.
The LS-3B is all solid state. It has no tubes.
Sorry, Joe has an LS-2B, not an LS-3.