The problem with the Freya+ is it doesn’t really provide the sound characteristics tubes are known for. Its tube stage sounds like what you get with a tube buffer, i.e. a very slight increase in “bloom.” Doesn’t matter what tubes you roll into the Freya, the result is essentially the same. The Freya+ is wholly better as a passive pre.
I can’t speak for the Cary’s sound but I had an opportunity to buy one NIB for a steep discount. I passed on it because many owner reviews of this model around the web are unenthusiastic, and I found multiple reports of reliability issues.
Generally speaking though, from a sound quality perspective, I think you would indeed be better off buying a pre-owned preamp that once retailed for multiples of the Freya’s price.