CJ is lush and rich or warm if you prefer . I think that is clear, but I disagree about ARC. My early ARC SP6B is not warm at all, not sure we are talking the same language but it was modded when I got it.
If you want a tube pre that leans towards the SS sound, ARC is for you, very clean, clear and I suppose neutral sound . I hesitate about neutrality because these are opinions about sonics not measurements by instruments.
BTW sometimes CJ warmth is a good thing, all depends on you, the track, and the rest of your gear.