Wyetech opal VS. Concert Fidelity-CF-080 LSX2-

Just picked up a Wyetech 211A topaz amp- The seller also has the matching Opal Pre- Just curious how this preamp would stack up against my Concert Fidelity preamp??- Thinking from a synergy standpoint would it be a better match- thanks
Concert fidelity not in the same league as the opal ,you want to make that topaz sing ,get rid of the Chinese 211 vt-4c ,and buy the RCA 211 that's what I'm using
how does the CF pre compare to the ruby which is better-