What's the best clan war cc troop?

I used to go with Wizards+Witch, but I've been going with Wizards+Barbs lately as I find that combo the most effective for my base.

No I'm not stupid, valkaries suck at high levels, but can destroy at town halls 6 and below. I've seen countless zero stars from my clan because of valkaries shredding lower level troops. Obviously they don't work as well at higher levels.