I don't like to use aluminum for anything, mainly that it fatigues more easily and will thin/break of strained. My home insurance provider also hates aluminum, I couldn't get insurance if I have any aluminum wire for my electrical work. Anytime I see it, I just want to pull it out.

CCA feels like the worst of both worlds.

Copper is king for me.

There's a plethora of problems that can be listed for both aluminum and copper and CCA. Aluminum/CCA is cheaper, but the trade-offs are not worth the savings IMO.