Ah, Different presentations my friend. I like the Cary's options/features. So if that is a priority - Also what amps are they driving, as synergy is a huge goal in my book. With Cary amps I'd go for the SLP.
But I am a huge Blue Circle fan. The 21.1 uses less tubes, so tube rolling to ones taste is much easier to accomplish. I think the 21.1 has a cleaner window esp with the Shallco. Better PRaT as well IMHO. Much better with long IC's as well.
If you are shopping new & used, maybe check out a used BC3? I think a MUCH better pre than either, and right now there seem to be a few available.
But I am a huge Blue Circle fan. The 21.1 uses less tubes, so tube rolling to ones taste is much easier to accomplish. I think the 21.1 has a cleaner window esp with the Shallco. Better PRaT as well IMHO. Much better with long IC's as well.
If you are shopping new & used, maybe check out a used BC3? I think a MUCH better pre than either, and right now there seem to be a few available.