I'm not sure as I have not heard the WA22, but i am inclined to speculate that it's more of a case of personal preferences rather than "competing".I have never heard any otl amp so I didn't know if a cheaper otl amp could compete with my wa22 and upgraded tubes.
From my limited experience with TC amps they seem to be more linear (clean, clear, crisp, direct) sounding than many OTLs I have heard. That being said I'm willing to guess that like OTL amps, not all TC amps sound the same.