C-J has always had more of the classic tubey sound to my ears which is a little fatter and warmer.
ARC has inched closer to solid state sound while still being able to capture the meat of the tube sound in the mids where they matter most.
While not on your list, the Cary SLP-05 is the finest tubed preamp I've had in my system. It has everything that it sounds like you're looking for. It splits the difference between the C-J and ARC house sounds IMO.
That's my experience anyway... good luck.
ARC has inched closer to solid state sound while still being able to capture the meat of the tube sound in the mids where they matter most.
While not on your list, the Cary SLP-05 is the finest tubed preamp I've had in my system. It has everything that it sounds like you're looking for. It splits the difference between the C-J and ARC house sounds IMO.
That's my experience anyway... good luck.